What are the most common problems with the BMW 6-Series?

The BMW 6 Series is a line of grand tourers that BMW has been producing since 1976. It succeeded the E9 Coupé and is now in its fourth generation. The 6 Series is a luxury car that has earned a reputation for its elegant design and powerful performance, which makes it a popular choice for enthusiasts and drivers looking for a seriously stylish ride. Available in coupe, convertible, and gran coupe body styles, the 6 Series offers the ideal blend of comfort and power. It’s known for its strong engine performance, precise handling, and luxury interior features.

Whether you’re driving a newer model with advanced technology or an older version that still holds its value, the BMW 6 Series, you’ll still get to enjoy BMW’s advanced engineering. However, like all vehicles, the 6 Series can be prone to wear and tear, making it essential for owners to be aware of common issues and know where to source reliable new or used BMW 6 Series parts for repairs and upgrades. Let’s take a closer look at these common problems and how to address them.

Common faults of the BMW 6-Series to be aware of

These vehicles have their fair share of quirks, from issues with the gearbox to the notorious convertible roof problems. Here are a few issues to be aware of.

Convertible roof problems

For owners of the 6 Series Convertible, the roof and position sensors can fail, preventing the roof from opening or closing correctly. Some drivers report that the convertible roof may say it is ajar when it is securely in place. If the roof is stuck and the dashboard light keeps flashing, it may indicate a faulty sensor. The issue is often due to electrical faults, but replacing the position sensor can usually resolve the problem.

Headlight condensation

Many BMW 6 Series owners experience condensation in their headlights, which can lead to serious issues with the wiring if not addressed. While replacing the headlight unit can be expensive, a DIY solution involves drilling a small hole at the bottom of the headlight to allow moisture to escape, preventing future condensation build-up.

Turbo issues (diesel models)

The twin turbos in the diesel 6 Series models are known to fail, typically producing a loud whistling noise or causing a lack of power when accelerating. In some cases, black smoke may be emitted from the exhaust. You’ll need to identify which turbo is faulty (the diesel 6 Series has two) and fit a replacement one to fix the issue.

Water leaks in the boot

The boot seals are known for failing, meaning water leaks into the boot, damaging electrical components and the car’s interior. If you notice that the carpets in the boot are damp, you will need to sort this out ASAP.

If you notice damp carpets in the boot, inspect the seals and replace them promptly to avoid costly repairs to electrical parts which are expensive to repair or replace.

Suspension and steering problems

A common issue among older 6 Series models is suspension wear, particularly in the front strut spring cups. These sit on top of the suspension dampers, and they have a tendency to rot, which can lead to suspension failure and total suspension collapse.

Additionally, steering problems, such as an active steering fault light, can sometimes occur due to low-power steering fluid or battery issues.

Gearbox concerns

Some BMW 6 Series vehicles, particularly those with automatic transmissions, can develop issues like sluggish or jerky gear shifts. If you notice thumping during downshifts or delayed acceleration, it could be due to low oil levels or a failing pressure sensor, which may require a replacement gearbox.

Engine troubles

The petrol engines in the BMW 6 Series, especially the V8, are prone to oil leaks, excessive oil consumption, and problems with the camshaft position sensor. V8s run at high pressure; older hoses and thermostats can fail, and the expansion bottle can explode.

Diesel variants can also suffer from issues with the crank dampener and inlet manifold leaks. In some cases, a replacement engine or gearbox may be required if the damage is severe.

Is the BMW 6 series reliable?

The BMW 6 Series is generally regarded as reliable, especially if it’s been well-maintained over the years, as many are. While it scores high in terms of performance and luxury, some specific issues, especially with older models or poorly maintained ones, can impact an individual vehicle’s overall reliability.

If you’re considering a used BMW 6 Series, it’s essential to check for the common issues mentioned above and ensure that necessary repairs or replacements have been carried out. Regular servicing and timely repairs can help maintain the car’s longevity and performance.

How much does it cost to maintain a BMW 6 series?

Maintaining a BMW 6 Series can be relatively expensive, especially if you need to replace parts like the engine, gearbox, or suspension components. On average, annual maintenance costs can range from £600 to £1,000, depending on the model and age of the vehicle. Independent garages are likely to be cheaper than franchise dealers, so it’s worth shopping around. Regular servicing is essential to prevent more costly repairs down the line, and sourcing replacement parts, whether new or used, can significantly impact your overall expenditure.