P0421 OBD Engine Code Logo   Code #P0421 -
Warm Up Catalyst Efficiency Below Threshold (Bank 1)

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Mitsubishi Montero Sport
Chekc


Na

Hyundai Sonata
code p0421


nothing just searching how to do the job

clear catalyst bank 1 bank 2

Mitsubishi Montero Sport
service light is on


check engine #P0421, P0455

ser my problem is how fix the code p0421 1 know what happen bot I don't know how catalystic it.i get Mitsubishi endeavor 2004

p0421 p0431

Check engine light and emmision light on



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Other Comments

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P0304 po304

P0327 Replaced both knock sensors on 2002 chevy pickup 5.3 liter engine. was showing code for knock sensor 2. now after replacement showing 0327 for knock sensor 1. Seems to be running a lot better since replacement but throwing a code.

P0660 P0660

P0704 p0077



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