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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P0466   EVAP Purge Flow Sensor Circuit Range/Performance
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P0482   Cooling Fan 3 Control Circuit
P0635   Power Steering Control Circuit
P0780   Shift
P0897   Transmission Fluid Deteriorated
P0962   Pressure Control Solenoid "A" Control Circuit Low
P0989   Transmission Fluid Pressure Sensor/Switch "E" Circuit Low




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