2003 Hyundai Santa Fe OBD11 Code P0421

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

1 Reply

Tiny
OBXAUTOMEDIC
  • EXPERT
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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Sunday, July 13th, 2008 AT 6:18 PM

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