Joseph Law

Bumper Content Writer

Alastair Shephard

Content Writer

Mercedes-Benz is the oldest car manufacturer in the world, producing the first ever car in 1885. From there they have developed a great reputation for reliability and build quality. Despite this, modern cars are complex, and there are some common faults recorded among Mercedes owners. 

Mercedes Benz is known for their reliability, with high ratings in WhatCar and Which surveys in recent years. They do not often top the charts, with brands such as 

Like most modern luxury brands, Mercedes are not low-maintenance cars, and you don’t want to skip scheduled maintenance items. With their dual-

 transmissions and complex turbocharged engines, they need the recommended oil and filter changes, at the least, to keep them running smoothly. 

There are not likely to be any definitive timescales to expect your Mercedes-Benz to start developing issues, but as with many cars, problems generally begin after around 7-10 years and around 100,000 miles. This is when items such as suspension arms, hydraulic engine mounts, and timing belts can need replacing.

 is that the ride is quiet, refined and free of vibrations for the passengers. To achieve this most modern premium vehicles have hydraulic engine mounts. These are oil-filled rubber dampers that are integral to the engine mounting brackets. 

Over time, the rubber wears and perishes by absorbing the engine's vibrations, causing the oil inside to leak out and further reduce its damping effect. Symptoms of this issue all relate to excessive vibration and noise from the engine. 

Another fantastic feature that enhances comfort for passengers is Mercedes' sophisticated air suspension system. It uses an air suspension strut in replacement of a traditional 

 and shock absorber to allow better ride quality and handling characteristics. 

Like the engine mounts, these air suspension components can become worn over time and start to fail. Perishing seals and rubber 

 are the usual culprits, with symptoms being unusual handling, an uneven ride height and errors from the infotainment system. 

to most automatic Mercedes vehicles in the last 10 years or so is a complex piece of engineering that enables fast gear changes and excellent efficiency. Unfortunately, they also need servicing correctly and on time to avoid damage. 

As the interval is usually 5 years or 70,000 miles, check any car you’re considering buying has had the required services, and is on time. Servicing the gearbox is quite a complex procedure, hence why many owners neglect to do it on time. 

As many Mercedes saloons and estates are rear-wheel drives, they have a separate rubber mounting at the rearmost point of the gearbox, where it connects to the propshaft. After a few years of use, this rubber mount can too begin to perish, allowing the metal portions of the mount to collide. 

This will cause a vibration and possibly more cabin noise, that will come from the floor in between the driver and passenger seat. New mounts are relatively inexpensive and not too difficult to replace. 

A problem exclusively affecting the A-Class from March 2018, the brake hose to the rear 

 is not long enough, causing strain on the connections as the suspension goes through its full range of motion. 

Mercedes issued a recall for the fault, and any Mercedes dealer will be happy to investigate and remedy it.

As Mercedes’ best-selling saloon, the C-Class is a popular sight on the road. It offers a good measure of luxury and performance, especially in the higher AMG trim levels. Here are a few common issues to look out for. 

If you notice poor economy and running with your 1.6 diesel C-Class, double-check it was not featured for a software recall. Mercedes updated the software on the car's 

, improving the driveability and emissions performance of the car. 

Affecting cars from 2014 through to 2018, you can check to see if your car, or one you are looking at buying, is affected 

Some high-performance versions of the C-Class were fitted with axle and differential mountings that were not quite up to the task of handling the C63 V8’s power, with differential mounting brackets cracking after hard acceleration. 

Software updates were rolled out to reduce the impact on the part, helping prolong its life. 

Mercedes offers a range of cars that solve multiple needs, from high performance and handling agility to comfort and refinement. If these are qualities you are looking for in your next vehicle and intend to maintain your vehicle well, a Mercedes would be a great fit. 

 can help if your car needs expensive repairs, by offering zero-interest finance plans. We have hundreds of partners 

 has been writing about cars for over seven years and writing for Bumper for over two, blending his passion for automobiles with a talent for storytelling.

Joseph has written about engineering and cars for Autozilla, Komaspec, and several engineering manufacturers. When he's not writing or tinkering with one of his five cars, Joseph dreams of owning an Alfa Romeo 33 Stradale.

5 Common Mercedes Problems & How To Prevent Them

5 Problemas Comunes en Mercedes y Cómo Prevenirlos

5 häufige Mercedes-Benz-Probleme und wie man sie behebt 

The Audi A3 is a popular premium hatchback, but like any car, it has some common reliability issues.

Owners frequently report problems with the DSG gearbox, suspension creaking, oil pump failures, and fuel line leaks. This guide covers the most common Audi A3 problems and how to avoid costly repairs.

Like any car manufactured in large numbers, the Audi A3 isn't without its own issues. 

While these common problems may point to areas needing improvement, they also serve as a helpful checklist for prospective buyers. 

Here are typical Audi A3 problems to note:

Some 2004–2008 Audi A3s with the 2.0 TDI engine have a known oil pump issue, where the drive shaft wears out prematurely. 

 which, if lost completely, may cause severe engine damage within minutes.

On some newer A3s (2016+), owners have reported creaks and rattles from the front suspension, even with low mileage.

Since there's no clear fix, listen closely on test drives. If your car’s doing this, try replacing the suspension bushes, like the bottom arms or top mounts.

On 2003–2012 TDI models, engine vibrations can crack diesel lines, hurting MPG and posing safety risks.

Luckily, replacement pipes are cheap, and vibration-reducing upgrades are available online.

A common issue with 2.0 TFSI engines is torn boost diverter valves, which cause a loss of air pressure. Under hard acceleration, you might notice 

Replacing the valve with an upgraded version solves the problem—it swaps the weak rubber diaphragm for a stronger one. It’s a quick fix for any experienced Audi tech.

 can droop over time. To check, see if it stays horizontal after use. 

If not, a garage can easily reposition it using a puller tool. This is usually cheap and prevents paint damage: a win-win!

Front wings rust early on many VW and Audi models. 

If your car’s under 10 years old, Audi’s rust guarantee covers it. If not, getting a wing from a parts car is usually cheapest.

 ranked the A3 last in their reliability leaderboard for 2022, and warranty provider MotorEasy gave it a reliability score of 63%. These indicate a few quality issues with A3s from 2021 onwards.

However, provided the car receives timely maintenance and repair, it should be as reliable as any other car in the same market segment. 

As most of the warranty claims were for automatic 

-related issues, we’d suggest the manual version.

What years of the Audi A3 should I avoid?

The A3 is generally reliable, but certain years have recurring issues. Here's a breakdown of the ones to avoid:

You can avoid some Audi A3 common issues by skipping these years. 

The Audi A3 isn’t the cheapest car to maintain, but it's not the most expensive either. 

Parts can be pricey, especially for newer models, and labour costs add up if you need 

. Regular maintenance and servicing are key to avoiding bigger bills, but overall, it’s manageable for a premium car.

How much does it cost to fix common Audi A3 problems? 

Below, we’ve detailed some rough cost estimates for fixing common Audi A3 problems.

Keep in mind that prices can vary based on location, parts, and labour costs.

DSG gearboxes are fantastic pieces of engineering; they are complex, and numerous reports of faults have developed if the service intervals have not been adhered to. 

For many years, the DSG type has been the go-to gearbox in Volkswagen Audi Group products. This dual-clutch gearbox offers fast gear changes and efficiency as good as the a manual transmission car.

DSG gearboxes rely on clean, free-of-contaminants oil, hence the recommended 

 interval of 40,000 miles. If you make sure these services are done, we don’t see why you won’t have a trouble-free experience.

Does the Audi A3 have a timing belt or timing chain?

The Audi A3 generally uses a timing chain, not a belt.

But watch out—older models with 2.0 TFSI or 2.0 TSI engines can have chain issues. Newer ones, like the 8V 1.2 TFSI, also use chains.

In general, most petrol engines use a chain, while many diesels, especially older ones, have a belt. Always check your specific engine code to be sure, and don’t skip scheduled belt replacements.

Are Audi A3s prone to electrical problems?

Some Audi A3 owners have reported electrical issues, such as problems with power windows, central locking, and the infotainment system. These are often caused by faulty wiring, sensors, or software glitches.

Likewise, Audi A3 owners have reported cluster failures (problems with the instrument cluster). These can cause incorrect readings, warning lights, or even blank screens.

While not always serious, they can be frustrating, so it’s worth checking that everything works properly before buying.

That wraps up the common Audi A3 issues. While there are a few known problems, the A3 still scores high on style, practicality, and efficiency. So don’t let a handful of minor faults put you off, as it remains a solid choice in its class, and you can trust 

Need to repair your Audi A3? We’re here to help.

, you can split the cost of repairs into monthly payments at no extra cost. 

Apply online for up to £5,000 and choose from 1,000s of trusted repairers. 

Common Audi A3 Problems

Häufige Probleme beim Audi A3

 is vital to the safe operation of your engine, the radiator plays a vital part of that. BMWs are no different, with many having larger or high-performance engines, it's even more important to fix your BMW radiator and get it replaced as soon as it breaks. 

As one of the most popular BMW models, the 3 series has been in production since 1975, with each new version being more sophisticated and better to drive than the last. 

If you take your car to the garage for it to be replaced, you can expect to pay anywhere from £200-1300 for your BMW 3 Series Radiator to be replaced, depending on your exact model and age. 

The smallest BMW in the range, the 1 series, is a practical but compact hatchback. It has been in production since 2004, when the original design was acquired by BMW from the Rover acquisition. 

For a BMW 1 Series radiator replacement, you should expect to pay between £350-1100 in the UK depending on your model. 

BMW offers a few different SUV models, they started with the X5 in 1999, and have since released the X1, X2, and X3. These offer SUV styling in a smaller overall vehicle size, making them more popular in cities and urban areas. 

How do I know if my BMW radiator is bad? 

There are two main warning signs that your 

, or water being lost from the expansion tank. 

An overheating engine can be symptomatic and the cause of serious engine issues, so it’s very important to drive as little as possible if your engine is above the normal temperature level. 

Leaks can sometimes be seen, either when driving or by noticing coolant on the floor when parked. Both of these can be caused by a leaking radiator or coolant system, and can be checked by monitoring the coolant level in the expansion tank. 

Like many vehicles there are some faults that are a common occurrence among BMW owners, alongside the infamous BMW 

 are a few coolant and radiator-related problems, read on to see if your car is affected. 

Used to contain the surplus coolant, and allow a moderate pressure to build in the system, the expansion tank is located under the bonnet, generally somewhere near the radiator. 

On some BMWs, mainly from the model years 2000 to 2008, the plastic expansion tank is known to develop leaks and even split open completely. Causing at first a slow loss of 

, followed by the system draining completely. 

If you notice your coolant tank leaking coolant, there are often uprated replacements you can replace it with, that retain the standard fitment and hose connections. 

Certain high-performance BMW models from 2009 through to 2016 were fitted with the N55 engine, this is a 6-cylinder 3-litre engine fitted to many cars including the 1 Series, 3 Series, X5, and X6. 

Certain versions of these engine and model combinations came fitted from the factory with a hard plastic link pipe on top of the radiator. The material used is susceptible to becoming brittle and cracking with the vibrations of the engine. 

This can cause a significant coolant leak. Thankfully it’s a simple fix that can be done by a home mechanic. 

A common theme from the Bavarian manufacturer is using inferior quality plastic where previously durable rubber or metal was better suited. Whilst not fitted to all their cars, models from the early to mid-2000’s such as E46 3 Series and 5 Series, had a plastic water pump. 

with these cars, the effectiveness of the water pump is the first thing the mechanic should check. 

Composite (plastic with fibre reinforcement) impellers were introduced shortly after BMW became aware of the problem. 

As the radiator is a relatively cheap part, it would usually be worth fixing a BMW radiator, assuming the rest of the car is in reasonably good condition, with no major issues such as rust or mechanical faults. 

Radiators are generally expected to last the economic life of the car, up to around 15-20 years. There is an outside chance it may receive damage by road debris or whilst other work is being carried out. 

That said, on cars 15 years or older, corrosion and wear may begin to catch up, this may be the case when a performance or special edition car has been kept on the road as a classic vehicle. 

What to do if your BMW radiator is leaking 

Because the coolant system is so important to any engine, we suggest not driving the car anymore than is necessary until it can be inspected. Whilst small leaks could be dealt with, they may be an indication of an impending catastrophic failure, which could leave you stranded. 

 with Bumper. We work with 1000’s of garages and service centres across the UK, to offer 

interest-free car repair payment with monthly installments

How Much Does A BMW Radiator Replacement Cost?

Wie viel kostet eine Autokühler-Reparatur? 

Door actuators are one of the many things used on modern cars to make them easier and more convenient to live with. In this article we’ll take a look at average costs to replace door actuators on BMWs and what causes them to fail. 

How much does it cost to repair a BMW Door Actuator? 

Thankfully, door actuators can be relatively inexpensive to replace. The parts are readily available and the labour times are not likely to exceed 1-2 hours in total. 

The biggest factor in how much a door actuator costs to replace is if you go with genuine BMW parts, or are happy to use aftermarket ones. 

One other factor is location, garages in and around London, expect to pay around 10-15% more for labour. 

It is likely if your car door won’t unlock using the remote key, or the lock button inside, that the door actuator has broken or seized. Check that the other doors still unlock and lock as they should. 

If more than one door stops working at the same time, it is unlikely both actuators have broken at the same time, after checking the fuses, consult an auto electrician to inspect the BCM or 

. There will be one in each door, including the boot lid. They contain either a small electric motor and mechanism or an electro-magnetic solenoid. 

If you have ever had a car without central locking - where you need to manually unlock and lock every door - you’ll surely appreciate the advantage of having door actuators! 

How Long Does it Take to Replace a Door Actuator? 

Because the door actuator is inside the door itself, usually the only component that needs to be removed is the door card, the upholstered covering you see on the inside of the door. 

After removing the door card, the actuator is often held in with 3 or 4 bolts and connects to the door lock mechanism with a metal or plastic clip. 

Can I replace a BMW Door Actuator Myself? 

If you have a reasonable array of tools and are comfortable with removing and replacing components then there is a good chance that you could replace your door actuator at home. 

Whilst cars differ from model to model, the general procedure to change a door actuator is: 

Because door actuators contain moving parts, there is always the possibility of things wearing out or seizing. Door actuators on older cars will have been activated thousands of times over the years and the grease lubricating them can become dry and ineffective. 

Once this happens, the motor works harder to actuate the door lock, eventually leading to it failing. 

How to Prolong the Life of Your Door Actuators 

If you notice your door locks sounding slower than then used to, creating a slow thud rather than a quick crack noise when locking or unlocking, it could be that the actuator or mechanism is lacking lubrication. 

To help prolong the actuators and make their job easier, remove the door card, and ensure all the mechanisms and links are free moving and not binding or scraping on the door frame. If possible apply some more grease to the lock mechanism and linkages. A PTFE-based spray lubricant would be best for the linkages, and a graphite lubricant for the lock itself. 

 with Bumper. Apply online before making your booking and choose from lots of 

BMW Door Actuator Replacement Cost 

Oil leak repair costs in the UK range from £75 to over £500, depending on the source of the leak. If ignored, a leaking valve cover gasket, sump plug, or rear main seal can lead to expensive engine damage. 

Are you facing car oil problems? This guide covers oil leak repair prices, causes, and how to fix them. Let’s go!

How much does it cost to repair an oil leak? 

Oil leak repair costs typically range from 

Here are UK cost estimates for common engine oil leak causes:

Split the cost of car repairs and services into interest-free monthly payments with 

Sometimes, your oil leak repair cost will be influenced by your car make and model. This is due to the availability of parts and specialist skills needed to repair the vehicle. 

Here are average oil leak repair prices for common leak problems:

Estimated costs may differ depending on your car and circumstances.

how much does an oil leak cost to fix, get to know the signs of an oil leak. This will help you avoid major damage.

How can you spot an oil leak in your car?

Worried your engine might be leaking oil? Before you estimate the 

Yes, if your engine is leaking oil, you are constantly running the risk of premature engine wear or failure. 

 is vital to the running of your engine, and you won’t get any warning signs the 

What happens if you don’t fix an oil leak?

Ignoring an oil leak can lead to engine damage, overheating, reduced performance, and even more costly repairs. 

Oil leaks lead to low oil levels, which starve the engine of lubrication. This can also lead to increased wear and risk of complete engine failure.

An oil leak repair usually takes 1 to 3 hours.

The time ultimately depends on the severity and location of the leak. Bigger jobs might take a full day if parts are harder to reach.

Can you stop an oil leak without going to a mechanic?

You might be able to stop minor oil leaks with a sealant or by tightening parts, but bigger leaks usually need a mechanic, especially if gaskets or seals need replacing.

Unless you have proficient knowledge, it’s always best to head straight to the garage!

No, today, it’s not normal for your car to have an oil leak.

In years past, it was normal for a car to leave a drop or two of oil on the floor while parked. However, any recurring leak in a modern car should be investigated, as it may indicate an underlying issue.

A few oil spots may not always mean disaster and large repair bills. It could be something as simple as some overspill from your 

If it happens regularly, definitely book an inspection from a mechanic. 

Whether or not you can drive with an oil leak depends on the severity of the leak and the distance of the drive.

If you notice one or two very small spots on the ground, it’s probably okay to drive a few miles to the garage. 

A leak much larger, or a distance much longer, and we’d definitely suggest leaving the car where it is until you can get it inspected properly. This is both to protect your wallet and other road users.

What are the most common causes of oil leaks?

The most common causes of oil leaks in cars include:

Regular maintenance helps catch these early before they become bigger (and messier) problems. Don’t skip your car service!

What does it mean if oil is dropping but there isn’t a leak? 

If your oil level is dropping but there's no oil on the floor, it may be entering the combustion chamber or the coolant system. 

Look for signs like blue smoke from the exhaust or a yellowish substance in the coolant. Learn more about 

exhaust smoke and the different types here.

Oil leaks can pop up when you least expect them, and they can come from all sorts of places—gaskets, seals, even the oil filter. Catching and fixing them early is key to avoiding serious engine damage and expensive repairs. 

Hopefully, this guide has given you a clear idea of what oil leak repairs might cost and what to check before calling your local garage.

Oil leaks can sneak up on you without warning—just like repair costs. 

With Bumper, you can split the cost of repairs into monthly payments at no extra cost with a 

Oil Leak Repair Costs In The UK — A Complete Guide

¿Cuánto cuesta reparar una fuga de aceite del vehículo en España?

Car radiator replacements usually cost anywhere between £300 to £950 in the UK. 

That’s a big price gap, but your car’s radiator is essential for keeping the engine running smoothly. It regulates temperature and prevents overheating, so if it fails, replacing it is crucial.

Radiators can fail in a few ways, and there are clear signs when they do. Here's how to spot the damage and what a new radiator repair might cost you.

How much do car radiators cost to replace or repair? 

Car radiator issues can range from minor leaks to full system failure. 

Repairs are often cheaper but temporary, while replacements are needed when damage is more serious or the part is too worn. 

 can help you split the costs into interest-free payments. 

Replacing a radiator in the UK typically costs between 

, depending on your car’s make, model, and labour rates.

Luxury or performance vehicles, such as BMW or Audi, may push this closer to £1,000 due to more complex systems and pricier parts.

This price usually includes a new radiator unit, coolant refill, and labour costs.

Radiator repairs are more affordable, with typical costs ranging from 

, depending on the extent of the issue and whether parts such as hoses or seals are affected. 

Common radiator repairs include patching small leaks, replacing cracked hoses or seals, or flushing out blockages.

While cheaper, these fixes may not be long-term solutions if the radiator is old or heavily corroded.

Car radiator replacement cost breakdown - Make vs location

Radiator replacement costs vary depending on several factors such as your location, the age of your car, and most importantly, the make and model. 

Prices provided are estimates and may differ based on these variables.

Your location can also affect the average price you’ll pay for a car radiator replacement. 

Here are average costs for key UK regions, but keep in mind that actual prices may vary depending on your vehicle, the garage, and the extent of the repair.

Expect to pay between £50 and £600 to fix a serious coolant leak from your radiator or cooling system.

However, other components can also cause leaks, which we discuss in more detail below.

Advice

5 Common Mercedes Problems & How To Prevent Them

Common Audi A3 Problems

How Much Does A BMW Radiator Replacement Cost?

BMW Door Actuator Replacement Cost

Oil Leak Repair Costs In The UK — A Complete Guide

How Much Does It Cost To Repair a Car Radiator?

Why Is Smoke Coming Out of My Exhaust & What The Different Colours Mean

Why is white smoke coming out of my exhaust?