2003 Hyundai Santa Fe Repair Question
Topics covered: Catalytic converter, Engine, Rebuilt.
Mileage: No information provided.
Mileage: No information provided.
Asked on July 13, 2008
2003 Hyundai Santa Fe OBD11 Code P0421
OBD Code Po421
Changed the catalytic converter recently.
Engine would hardly go over 15 mph.
Repaired broken valve #2 cylinder.
New valve job.
New rebuilt transmission.
Suspect Vacuum leak or oxygen sensor
Asked by Dale BlackwellAnswer
Replied on July 13, 2008
Ok, so vehicle is running fine now and only need info on code?
Code Definition:
P0421 - Warm Up Catalyst Efficiency Below Threshold
