2000 Volvo S70 Q&A
2000 Volvo S70 Question: po code 174, 304, and 304
If it is a fault code for a lean condition and misfire I would recommend: Smoke test the intake system for leaks, repair any leaks. If fault returns it could possibly have a faulty Mass Air Flow Meter - Bertinis
mechanic says po302,304,305 300 all connected.