2004 Subaru Forester Q&A
2004 Subaru Forester Question: just failed Mass Emissions Inspection. OBD codes P0303 and P0457.
p0303 cylinder 3 misfire p0457 evap. system leak detected. Usually not too expensive. Cylinder 3 probably has bad spark plug or ignition coil. Evap. system leak can be found by a shop running a 'smoke test' to locate the leak and then repaired. - csubak30