BMW 640i Repair and Maintenance

A guide to problems, costs, maintenance and repair for your BMW 640i

BMW 640i Problems

Check Engine Light with Code P30FF and Rattle from Engine

The BMW 640i turbo engine may suffer from waste gate issues which become progressively worse with normal driving and especially with harsh driving conditions.

The turbocharger uses exhaust gas to create air pressure which is then forced into the engine. When there is no demand for power, the exhaust gases are released into the exhaust through a waste gate to prevent the turbo from speeding up.

“Waste gate rattle” or “Turbo rattle” is a result of excessive movement between the waste gate and the waste gate seat. This is a progressive issue with the following symptoms:

  • Rattling at cold start
  • Rattling upon deceleration
  • Loss of power
  • Check Engine Light Illumination
  • Manufacturer Specific OBD trouble code P30FF
  • Very poor engine performance and MPG

Adjustment of the waste gate actuator can solve the issue, but the issue will return. If adjustment does not correct the issue, the turbocharger waste gate must be rebuilt with new bushings, or the turbocharger must be replaced. BMW has replaced many turbocharger assemblies under warranty to correct this issue.

See More Problems (1)

BMW 640i Recalls

Fuel Leaks And Vehicle Stalls From In Tank Fuel Pump Wiring Concern

The in-tank fuel pump may have wire contacts that are not properly crimped, resulting in the wiring connector melting, fuel leakage and vehicle stalling. Dealers will replace the fuel pump module free of charge to resolve the concern.

Engine Timing Bolts May Loosen And Break

The bolts that secure the housing for the variable camshaft timing adjustment unit can loosen over time and possibly break, causing engine damage and engine stalling. Dealers will replace the four bolts for both intake and exhaust timing units free of charge to resolve the concern.

See More Recalls (2)