P0421 OBD Engine Code Logo   Code #P0421 -
Warm Up Catalyst Efficiency Below Threshold (Bank 1)

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Mitsubishi Montero Sport


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

P0530 Daewoo Nubira
ac refrigerant pressure sensor Circuit malfunction

P0746 ac refrigerant pressure sensor

P0746 Daewoo Nubira

P0746 P 0530

P0615 none starte

Other Check Engine Light Codes

P0212   Injector Circuit - Cylinder 12
P0305   Cylinder 5 Misfire Detected
P0404   Exhaust Gas Recirculation Control Circuit Range/Performance
P0439   Catalyst Heater Control Circuit (Bank 2)
P0631   VIN Not Programmed or Mismatch - TCM
P0810   Clutch Position Control Error
P0841   Transmission Fluid Pressure Sensor/Switch 'A' Circuit Range/Performance
P0859   Traction Control Input Signal High
P0871   Transmission Fluid Pressure Sensor/Switch "C" Circuit Range/Performance
P0924   Gear Shift Reverse Actuator Circuit/Open

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