The BMW 3 series is arguably one of the most popular models that are purchased, whether that is brand new or used. Unfortunately, the 3 series is suspect to a few common faults, no matter what age.
During this post, as BMW specialists, we’re going to go through some of the common failures for BMW 3 series and explain how you can go about getting them repaired.
If you’re pretty hands on and know your stuff about auto mechanics, you may well be able to complete some of the tasks yourself. However, if you’re a little unsure and need assistance you should seek assistance from a BMW repair garage in Milton Keynes.
Highlighting Faults for BMW 3 Series:
The best way to highlight any problems with your BMW is to make sure that you regularly check the dashboard and on board computer for any error messages and warning lights.
These are the clearest indication that there is an error or fault that needs to be repaired. If your BMW has an on board computer make sure that the software has been updated – we have many appointments for diagnostics on BMW’s when the real fault is out of date software.
Moving on; the three common faults that we are going to discuss in this article are:
- DPF Warnings (Diesel Particulate Filter)
- Loss of Power & Misfiring
- Rear Light Failures
Diesel Particulate Filter (DPF) Warning Lights:
The Diesel Particulate Filter (DPF) on any car and especially BMW’s is a filter designed to work solely with diesel-powered engines. They are there to remove the small pieces of diesel matter, grit and soot that are produced within the exhaust of a diesel engine.
If you own a BMW 3 series, you may find that the DPF warning light comes on after a period of time. This warning light means that the DPF filter needs to be replaced as it has become clogged up.
Vehicles with DPF’s installed are not designed for short journeys.
However, instead of visiting a BMW service Milton Keynes to replace the filter there is one thing that you can try first. Take your vehicle out onto a piece of private land or open road, driving at approximately 2500rpm in fourth gear for 10-15 minutes.
This will allow the exhaust to become hot and should burn off the particles that have clogged the DPF. If the warning light remains, book at appointment at a BMW servicing garage.
Loss of Power and Misfiring:
The most common cause for loss of power and a misfire for any car is down to a failure within the ignition system. There are a number of components built into the ignition system that include spark plugs, ignition cables, distributor caps and ignition coils.
Over time these components can become corroded and wear down.
If the ignition system cannot provide the required spark to launch the fuel and air mixture, the engine will misfire and will struggle to accelerate. In some cases, replacing the corroded spark plugs or entire coil packs can repair the faults.
An alternative reason behind losing power could be due to a faulty crank or camshaft. The best way to repair this is to run a diagnostic on a car with the fault. This will highlight areas that need action.
Rear Lighting Failure:
Light failures on a BMW 3 series could be due to a couple of reasons. The most obvious being a damaged or burnt out bulb. Try replacing the bulb first as these can be purchased relatively cheaply.
However, if the bulb replacement doesn’t work then there could be an issue with the rear light cluster and associated connectors. The easiest way to repair this fault is to have the connection plugs replaced.