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Why does my 2007 Audi RS4 have an EPC light and rough idle?

A sourced answer about EPC warnings and rough idle in a 2007 Audi RS4.

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Euro-Tech Motors

Expert companyLos Angeles, California

The EPC light and rough idle in this Audi RS4 traced to a failed secondary-air-injection pump relay that disrupted the ground circuits for several engine-management systems.

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