Quote:
Originally Posted by feuer
Exactly. Try coils and spark plugs on cyl 4 and 6 (codes p0304 and p0306). The code for o2 sensor might be because cyl 4 and 6 are misfiring. Put these coils and spark plugs on cyl 1, 2 and 3. Spread them around amount cyl 1, 2 and 3. If codes follow you found your problem. If codes don't follow then is something else like injector, o2 sensor, clogged up catalyst, vacuum leak. Definitely not Vanos solenoids 😆
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This! I've had misfire codes come up for a number of different reasons and this is the best way to start diagnosing.