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

Mitsubishi Eclipse

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 Vibrate? Shake?
Does your Car Idle Roughly? Reduced Power?

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Other Comments

P0070 P0179

P0191 Rav 4 have rough idle and shut off when engine gets hot

P0706 Suzuki Aerio
El codigo es p0171

P0706 P0171

P0183 Prende la luz de servicio

Other Check Engine Light Codes

P0050   HO2S Heater Control Circuit (Bank 2
P0130   O2 Sensor Circuit (Bank 1 Sensor 1)
P0266   Cylinder 2 Contribution/Balance
P0379   Timing Reference High Resolution Signal 'B' No Pulses
P0380   Glow Plug/Heater Circuit 'A'
P0576   Cruise Control Input Circuit Low
P0647   A/C Clutch Relay Control Circuit High
P0718   Input/Turbine Speed Sensor Circuit Intermittent
P0750   Shift Solenoid 'A'
P0887   TCM Power Relay Control Circuit High

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