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
P0340


light came on

advicesaid thiscode poing upwatdoes it mean

Ford Taurus
getting code p0420


Chevrolet Optra
2004


check engine light. fixed exhaust leaK.

Suzuki Grand Vitara
p0420


new fuel pump

P0420

Toyota Tacoma
2001


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

Suzuki Forenza
codigo p0420


Missing replaced 02 sensor



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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

P0443 Mercury Marquis
code po443 on I replace purgin valve check engine light comes on and stay on


P0443 check engine light on all time engine runs good

P0897 0897 AND 0843

P0843 PO897 CODE AND P0843 CHECK TRANSLIGHT ON

P0332 Kia Clarus
Error Code P03 Phase Sensor, where is Phase Sensor on KIA Clarus Model 2000 GLX.




Other Check Engine Light Codes

P0102   Mass or Volume Air Flow Circuit Low Input
P0179   Fuel Composition Sensor Circuit High Input
P0248   Turbo/Super Charger Wastegate Solenoid 'B' Range/Performance
P0566   Cruise Control Off Signal
P0618   Alternative Fuel Control Module KAM Error
P0752   Shift Solenoid 'A' Stuck On
P0775   Pressure Control Solenoid 'B'
P0807   Clutch Position Sensor Circuit Low
P0861   Gear Shift Module Communication Circuit Low
P0868   Transmission Fluid Pressure Low




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