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

P0605 p0605

P0404 Chrysler 300
check engine light won't go out


P0404 check engine light won't go out

P0513 Land Rover LR3
Changed the crankshaft position sensor and the car ran fine for a week then went to start it and won't even turn over.dtc code p0513


P0513 2006 land rover lr3 car will not staet



Other Check Engine Light Codes

P0044   HO2S Heater Control Circuit High (Bank 1 Sensor 3)
P0246   Turbo/Super Charger Wastegate Solenoid 'A' High
P0353   Ignition Coil 'C' Primary/Secondary Circuit
P0381   Glow Plug/Heater Indicator Circuit
P0607   Control Module Performance
P0617   Starter Relay Circuit High
P0647   A/C Clutch Relay Control Circuit High
P0662   Intake Manifold Tuning Valve Control Circuit High (Bank 1)
P0834   Clutch Pedal Switch 'B' Circuit Low
P0866   TCM Communication Circuit High




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