P0420 OBD Engine Code Logo   Code #P0420 -
Catalyst System Efficiency Below Threshold (Bank 1)

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Your Catalytic Converter or Oxygen Sensor is probably not working correctly as they are returning different readings. Using Regular Unleaded instead of Premium (if the car's manual requires it) could cause this. Catalytic Converters are very expensive to replace ($1200+) so if that is indeed the problem you can find 49-state legal versions (not California) that seem to do okay although they don't last as long (probably 15k-45k) and may or may not pass inspections. Be careful as sometimes these "bolt on" versions may require welding or other adjustments: you may want to check out a good muffler shop.

Opel Astra
it just start normaly, works fine like always, but the light just pop on.

Dodge Grand Caravan
I have replaced the 02 bank1 sensor twice,but I am still getting the same 2 codes (p0420 and p0032)

BMW 316i

light came on

advicesaid thiscode poing upwatdoes it mean

Ford Taurus
getting code p0420

Chevrolet Optra

check engine light. fixed exhaust leaK.

Suzuki Grand Vitara

new fuel pump


Toyota Tacoma

1. rough idle 2. gas mileage low

Mercury Mountaineer
no accurate diagnosis from mechanic

hesitation loss of power

it want stay running...........i have not fix it yet

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Tell us about Code #P0420

When did your Check Engine Light Come On?
Does your Car Start?
Does your Car Vibrate? Shake?
Does your Car Idle Roughly? Reduced Power?

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Other Comments

P0132 Chrysler Pacifica
Codigo po132 y codigo po456

P0132 Oxigen censor

P0305 Ford F-350 Super Duty
Where cylindre #5

P0238 Loosing coolant internal

P0897 Cadillac SRX
obd code P0897 what do this mean

Other Check Engine Light Codes

P0111   Intake Air Temperature Circuit Range/Performance Problem
P0147   O2 Sensor Heater Circuit (Bank 1 Sensor 3)
P0310   Cylinder 10
P0393   Camshaft Position Sensor 'B' Circuit High Input (Bank 2)
P0443   Evaporative Emission Control System Purge Control Valve Circuit
P0737   TCM Engine Speed Output Circuit
P0744   Torque Converter Clutch Circuit Intermittent
P0847   Transmission Fluid Pressure Sensor/Switch 'B' Circuit Low
P0938   Hydraulic Oil Temperature Sensor Range/Performance
P0952   Auto Shift Manual Control Circuit Low

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