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

Nissan Altima
code p0446




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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

P0071 Air tempetures sensor performance

P0560 Unhook the battery cable for one minute an put back an now my 2014 toyota camry the check engine light is on

P0135 2004 accord replaced o2 sensor still get po135

P0848 Honda Pilot / Transmission shifts properly the only concern is the D starts flashing at random / but it will still shift and operate properly.

P0650 Chevrolet Impala
didn't pass emission test




Other Check Engine Light Codes

P0154   O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
P0266   Cylinder 2 Contribution/Balance
P0285   Cylinder 9 Injector Circuit Low
P0313   Misfire Detected with Low Fuel
P0630   VIN Not Programmed or Mismatch - ECM/PCM
P0703   Torque Converter/Brake Switch B Circuit
P0793   Intermediate Shaft Speed Sensor Circuit No Signal
P0891   TCM Power Relay Sense Circuit High
P0974   Shift Solenoid "A" Control Circuit High
P0975   Shift Solenoid "B" Control Circuit Range/Performance




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