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Codes 0300,0304,0305 and 0306

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Codes 0300,0304,0305 and0306. Coils and plugs good. What else could it be?

Vehicle: 02 Audi a4 , 3.0 v6 Quattro

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how did you check that you know coils and spark plugs are fine? other thing to check is the fuel injectors.

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