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My 2004 Audi S4 4.2L CEL came on this weekend the codes are p0174 and p0175 system to rich bank 1 and 2. Check air filter and it looks clean, could this be a Mass airflow sensor? What should be my plan of attach or simply just take it into the shop? Cheers,
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We have seen this related to failures in regards to the high pressure fuel pump. It could be a number of things but having worked on several of the S4's we have seen this as a cause for this fault code. I would recommend bringing it in for further diagnosis.