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 Check Engine Light Codes

P0110   Intake Air Temperature Circuit
P0118   Engine Coolant Temperature Circuit High Input
P0186   Fuel Temperature Sensor B Circuit Range/Performance
P0301   Cylinder 1 Misfire Detected
P0345   Camshaft Position Sensor 'A' Circuit (Bank 2)
P0445   Evaporative Emission Control System Purge Control Valve Circuit Shorted
P0513   Incorrect Immobilizer Key
P0606   ECM/PCM Processor
P0950   Auto Shift Manual Control Circuit
P0988   Transmission Fluid Pressure Sensor/Switch "E" Circuit Range/Performance




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