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


Suzuki Grand Vitara
Code just appeared went on trip over weekend I just cleared code and will try driving for awhile filled with fuel up north pa maybe gas




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Other Comments

P0118 Engine sensor

P0134 replaced both bank 1 and bank 2 sensors

P0837 Po837

P0508 GMC Envoy XL
Po506 code check engine light on


P0571 Acura RDX
P0571. how to fix?




Other Check Engine Light Codes

P0014   'B' Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
P0031   HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0418   Secondary Air Injection System Relay 'A' Circuit
P0480   Cooling Fan 1 Control Circuit
P0767   Shift Solenoid 'D' Stuck On
P0774   Shift Solenoid 'E' Intermittent
P0852   Park/Neutral Switch Input Circuit High
P0888   TCM Power Relay Sense Circuit
P0927   Gear Shift Reverse Actuator Circuit High
P0960   Pressure Control Solenoid "A" Control Circuit/Open




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