Mechanics

OBD11 CODE P0421

2003 Hyundai Santa Fe

Computer problem
2003 Hyundai Santa Fe 4 cyl Two Wheel Drive Automatic 72000 miles

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
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Dale Blackwell
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

Obxautomedic
Jul 13, 2008.


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