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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Does your Car Idle Roughly? Reduced Power?

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Other Comments

P0706 Acura 3.2TL
po705 po706 intermitting start


P0337 Kia sorento 2004 shutdown while driving Show PO128, PO183, PO337 code Fuel pump change Crankshaft sensor change still shutting down

P0421 Mitsubishi Eclipse
p0421


P0882 wont change gears

P0942 Alfa Romeo 159
Me aparece error y no se que es




Other Check Engine Light Codes

P0256   Injection Pump Fuel Metering Control 'B' (Cam/Rotor/Injector)
P0291   Cylinder 11 Injector Circuit Low
P0381   Glow Plug/Heater Indicator Circuit
P0467   EVAP Purge Flow Sensor Circuit Low Input
P0604   Internal Control Module Random Access Memory (RAM) Error
P0664   Intake Manifold Tuning Valve Control Circuit Low (Bank 2)
P0849   Transmission Fluid Pressure Sensor/Switch 'B' Circuit Intermittent
P0878   Transmission Fluid Pressure Sensor/Switch "D" circuit High
P0910   Gate Select Actuator Circuit/Open
P0931   Gear Shift Lock Solenoid Control Circuit High




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