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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Does your Car Idle Roughly? Reduced Power?

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Other Comments

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P0843 Po843 can I drive it on highway to dealership

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Other Check Engine Light Codes

P0252   Injection Pump Fuel Metering Control 'A' Range/Performance (Cam/Rotor/Injector)
P0411   Secondary Air Injection System Incorrect Flow Detected
P0510   Closed Throttle Position Switch
P0709   Transmission Range Sensor Circuit intermittent
P0831   Clutch Pedal Switch 'A' Circuit Low
P0933   Hydraulic Pressure Sensor Range/Performance
P0950   Auto Shift Manual Control Circuit
P0980   Shift Solenoid "C" Control Circuit High
P0984   Shift Solenoid "E" Control Circuit Range/Performance
P0993   Transmission Fluid Pressure Sensor/Switch "F" Circuit Range/Performance




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