P0401 Exhaust Gas Recirculation Flow Insufficient Detected
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P1456 Leak Detected In EVAP Control System
codes are kind of vague, but, 401 can mean pcv valve, clogged, which, you should change anyway, because its such a cheap fix, also, the egr valve could be faulty, or Im guessing the egr tube is clogged, .420 could be a bad oxygen sensor on bank 1 or even a clogged, catalyctic converter, I would go with the oxygen sensor, but you can put your hand on the muffler really quick when you first get it started, to see if you can feel a strong pressure from the exhaust. No p1456, can mean a bad, fuel cap, or a bad evap canistor, or a hole in the evap canister hose. Try the gas cap first, so many people fail inspection just because of that, its pitiful, and a weak gas cap will give you a check engine light, we wont worry about the tps just yet.
Thursday, July 23rd, 2009 AT 11:55 AM