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

Mitsubishi Eclipse
p0421




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Does your Car Idle Roughly? Reduced Power?

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Other Comments

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P0421 Mitsubishi Eclipse
p0421


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P0942 Alfa Romeo 159
Me aparece error y no se que es




Other Check Engine Light Codes

P0011   'A' Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
P0128   Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
P0273   Cylinder 5 Injector Circuit Low
P0338   Crankshaft Position Sensor A Circuit High Input
P0408   Exhaust Gas Recirculation Sensor 'B' Circuit High
P0502   Vehicle Speed Sensor Circuit Low Input
P0509   Idle Control System Circuit High
P0706   Transmission Range Sensor Circuit Range/Performance
P0804   1-4 Upshift (Skip Shift) Lamp Control Circuit
P0815   Upshift Switch Circuit




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