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

P0263 Injection pump knocks

P0010 When idleing car jumps

P0191 Startup and run for a second and shutdown I haven't Replaced anything

P0191 2008 s63 amg M.B. start up and run for a second and shut down

P0775 need help in locating b valve solenoid or do i need the tcm that goes with that tranny



Other Check Engine Light Codes

P0077   Intake Valve Control Solenoid Circuit High (Bank 1)
P0245   Turbo/Super Charger Wastegate Solenoid 'A' Low
P0259   Injection Pump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
P0329   Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)
P0488   Exhaust Gas Recirculation Throttle Position Control Range/Performance
P0708   Transmission Range Sensor Circuit High Input
P0770   Shift Solenoid 'E'
P0804   1-4 Upshift (Skip Shift) Lamp Control Circuit
P0821   Gear Lever X Position Circuit
P0889   TCM Power Relay Sense Circuit Range/Performance




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