My80,000 mile 2.0TFSI Turbo Audi has lost a lot of performance but produces no check-engine-light (CEL) or codes. Audi A4 2007 2.0T boosts but poor performance, fuel economy. Ask Question Asked 11 years, 08 Audi A4 B7 2.0T DTC P0503 speed sensor erractic/high. 4. Ford TDCi 1.6: more performance in cold weather
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audi a4 b7 2.0 tfsi quattro exhaust
