Common BMW Problems
(ie. Oil filter housing gasket, valve cover gaskets)
Power steering leaks
(ie. Power steering reservoir, power steering hoses)
(ie. Radiator, expansion tank, coolant hoses)
Fuel pressure concerns
(ie. High pressure pump malfunction)
Check engine light
The most common issues that can make your BMW check engine light illuminate include:
Oxygen sensor – can cause a decrease in gas mileage and increased emissions
Gas cap – if loose or cracked can signal a leak in the Evaporative Emissions System
Catalytic converter – reduces exhaust gases and also affects gas mileage.
Note that if the light comes on and you are notified of a PO420 code, or “cat code”, you most likely have a faulty oxygen sensor, an exhaust leak, or an abnormal fuel mixture, but probably not an issue with the catalytic converter.
"Reduced power" message on instrument cluster
Brake lights often come on at the same time as a result of wheel speed sensor failure, as they are the ABS system components exposed to the greatest amount of wear. If the ABS light is still on after all repairs have been completed, there may be an issue with the instrument cluster itself, but more likely than not there is still an issue with the ABS module. To reset the instrument cluster and check for issues, disconnect the battery for an hour and see if the light has gone out once it’s reconnected.
In addition to the speed sensor, any basic problem that causes the rear brakes to apply too quickly can activate the ABS. These issues may include cracked rear linings, oil-contaminated linings, weak brake return springs, or a faulty proportioning valve.
The service indicator light on your BMW will illuminate periodically as a reminder that your vehicle is in need of service, including routine oil changes and other simple maintenance. It is possible to reset the light yourself if you perform your own oil changes, or if the light refuses to go off after your vehicle has been serviced.
To Reset: Hold down the odometer reset button and simultaneously put the keys into the ignition and turn them once to the accessory position. Keep holding the reset button until the indicator light flashes and the word “Reset” is displayed. Next, release the button and press and hold it one more time. Once it is released, five green LED lights will appear showing that the system was reset.
Since the BMW cooling system only holds a small amount of coolant, it is important to have your vehicle repaired shortly after it shows signs of overheating. Generally, coolant parts should be replaced every 60,000 miles to avoid issues.
If your vehicle does overheat, there are a few different possibilities for the cause of the problem. First, a failing coolant reservoir or radiator can result in pressure issues that prevent coolant from reaching the engine, which then overheats. In addition, the engine fan may need a repair or replacement so that air continues to flow properly through the radiator to prevent the vehicle from overheating at low speeds. A defective thermostat that limits the flow of coolant to the radiator is also an option if your engine is overheating.
Steering wheel shakes/pulsation while braking
Warped rotors are a frequent cause of vehicle pulsation while braking. Your steering wheel may also shake if your rotors are worn, as the wheel vibration is transferred to the steering column through the front-end components that the brake calipers are bolted to. If your rotors are only slightly warped or worn, you may be able to get away with only having them straightened out. However, if they are new or have just been replaced, they may not have been properly mounted to the axle.
Window doesn't go up or down/crunching noise while moving windows
There is most likely a problem with your power window regulator. Issues with the power window regulator mechanism can cause the windows on your vehicle to refuse movement. An electrical problem with the window regulator can cause the window to roll up or down slower than it should, but before assuming the regulator is the issue, make sure the window switch itself is inspected, as this is also a likely cause of window failure. If you hear clicking or grinding when the window is rolled up or down debris may be trapped between the window and the motor assembly, which can cause the regulator to work harder than it should to move the window.
(ie. Battery keeps dying)
Often poor battery life is caused by parasitic drain caused by electrical components in your vehicle that continue drawing current after it is turned off. While some drain is normal (i.e. for the clock, radio, and security alarm), electric problems such as a faulty seat control module can result in too much battery drain when your vehicle is not running. Service information published by BMW shows a timeline for current draw after vehicle shut down. After an hour, the parasitic loss should be less than or equal to 30 milliamps or 0.0s of an ampere-hour.
An alternator with a faulty diode that causes the circuit to charge even when the engine is off can also cause excessive battery drain.