BMW Alpina B8 Gran Coupe service by top-rated mechanics at the convenience of your home or office

Hi there. In most cases, when you hear a constant squealing noise while driving it's due to a serpentine belt that has become loose and need to be replaced (https://www.yourmechanic.com/services/serpentine-drive-belt-replacement). It could be a different belt, pulley or the power...

The P0155 (https://www.yourmechanic.com/article/p0155-obd-ii-trouble-code-02-sensor-heater-circuit-malfunction-bank-2-sensor-1-by-jamahl-walker) is the oxygen sensor located on the rear bank of cylinders and before the catalytic converter. Given your mileage, both oxygen sensors (https://www.yourmechanic.com/services/oxygen-sensor-replacement) (pre-catalytic converter) should be replaced. The pre-cat sensors have the most affect on fuel...

If you left any connectors loose or broke and seals in the process of the repair, a bad vacuum leak may cause your concerns. A technician equipped with a professional scanner may be able to hook up to the car...

Hello there, a few common faults will cause your 2004 BMW 540i to have a misfire on acceleration. Without knowing what code the engine is storing I can only offer general advice. Likely causes for the car to misfire like...