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


Mazda Protege
Code P0421 after having a missfire. Car still runs fine, but I'm tackeling this a bit at a time. Checked O2 sensors, cleaned the cat, code gone for 5 weeks, and came back on.




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Does your Car Idle Roughly? Reduced Power?

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Other Comments

P0606 Alfa Romeo 159
p0813


P0717 2009 Scion XB P0717. Replaced TS sensor twice problem keeps coming back

P0237 Mercedes-Benz C230
P0237 -I need to replace the turbocharge boost sensor, but I was told this vehichel doesn't have one.


P0562 Chrysler PT Cruiser
Got this code after car won't start meaning low voltage...battery good so taking off altenator to get it checked . I was hoping it was a broken belt but wasn't..Didn't realize they had two belts originally.One goes to alt.only


P0121 No acelera a más de 1500 rpm y una vez se le cambio el sensor de pedal de acelerador y funcionó y un mes después lo volvió a generar y no se que más pueda se



Other Check Engine Light Codes

P0255   Injection Pump Fuel Metering Control 'A' Intermittent (Cam/Rotor/Injector)
P0325   Knock Sensor 1 Circuit (Bank 1 or Single Sensor)
P0344   Camshaft Position Sensor 'A' Circuit Intermittent (Bank 1 or Single Sensor)
P0439   Catalyst Heater Control Circuit (Bank 2)
P0450   Evaporative Emission Control System Pressure Sensor
P0491   Secondary Air Injection System (Bank 1)
P0513   Incorrect Immobilizer Key
P0575   Cruise Control Input Circuit
P0793   Intermediate Shaft Speed Sensor Circuit No Signal
P0876   Transmission Fluid Pressure Sensor/Switch "D" Circuit Range/Performance




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