2003 Hyundai Santa Fe OBD11 Code P0421

DALE BLACKWELL

MEMBER
2003 HYUNDAI SANTA FE
4 CYL
2WD
AUTOMATIC
72,000 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

Sunday, July 13th, 2008 AT 4:09 PM

1 Reply

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Ok, so vehicle is running fine now and only need info on code?

Code Definition:

P0421 - Warm Up Catalyst Efficiency Below Threshold

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