Engine Performance problem
2000 Mitsubishi Galant 6 cyl Front Wheel Drive Automatic 297000 miles
OBD Code PO421 is registering on my car. According to what I'd read it means the "Warm up catalyst efficiency is below threshold bank 1". I'm told that translates to the sensor behind the ccatalyst converter is not functioning properly. Is that something I can change myself or do I need to have a qualified mechanic do it?
have the same problem?
Friday, July 3rd, 2009 AT 11:00 AM