2003 Hyundai Santa Fe OBD11 Code P0421

2003 HYUNDAI SANTA FE

72,000 MILES • 4 CYL • 2WD • AUTOMATIC

DALE BLACKWELL

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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

Jul 13, 2008 at 4:09 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.

OBXAUTOMEDIC

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[quote:423a209e86="Dale Blackwell"]Computer problem
2003 Hyundai Santa Fe 4 cyl Two Wheel Drive Automatic 72000 miles
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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[/quote:423a209e86]

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

Code Definition:

P0421 - Warm Up Catalyst Efficiency Below Threshold

Jul 13, 2008 at 6:18 PM