My car is making a humming sound but only once in awhile. I believe it has something to do with the fuel system because when I engage the accelerator it goes away. Not sure what it may be. Car 2002 Boxster 2.7
Another question: I replaced the four O2 sensors are there any adjustments that are required?
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Pelican Technical Article: Boxster Engine Sensor Replacement - 986 / 987