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

P0884 Jeep Grand Cherokee SRT-8
p0884


P0783 P0783

P0012 p0015

P0702 P0702- My MB C240 does not go over 30 miles (its automatic transmission do not catch the speed change)

P0193 p0193



Other Check Engine Light Codes

P0020   'A' Camshaft Position Actuator Circuit (Bank 2)
P0200   Injector Circuit
P0233   Fuel Pump Secondary Circuit Intermittent
P0242   Turbo/Super Charger Boost Sensor 'B' Circuit High
P0508   Idle Control System Circuit Low
P0755   Shift Solenoid 'B'
P0767   Shift Solenoid 'D' Stuck On
P0853   Drive Switch Input Circuit
P0948   Hydraulic Pump Relay C ircuit High
P0978   Shift Solenoid "C" Control Circuit Range/Performance




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