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


engine light on wont pass emissions already fixed 1 02 sensor



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Does your Car Idle Roughly? Reduced Power?

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Other Comments

P0237 Mercedes-Benz C230
P0237 -I need to replace the turbocharge boost sensor, but I was told this vehichel doesn't have one.


P0562 Chrysler PT Cruiser
Got this code after car won't start meaning low voltage...battery good so taking off altenator to get it checked . I was hoping it was a broken belt but wasn't..Didn't realize they had two belts originally.One goes to alt.only


P0121 No acelera a más de 1500 rpm y una vez se le cambio el sensor de pedal de acelerador y funcionó y un mes después lo volvió a generar y no se que más pueda se

P0607 Ford Fiesta
Won't turn over. when I get it to turn over it starts but does not go into gear, it just flashes between park, neutral, and drive.


P0607 Ford Fiesta
Won't turn over. when I get it to turn over it starts but does not go into gear, it just flashes between park, neutral, and drive.




Other Check Engine Light Codes

P0071   Ambient Air Temperature Sensor Range/Performance
P0139   O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0225   Throttle/Pedal Position Sensor/Switch 'C' Circuit
P0312   Cylinder 12 Misfire Detected
P0339   Crankshaft Position Sensor A Circuit Intermittent
P0361   Ignition Coil 'K Primary/Secondary Circuit
P0460   Fuel Level Sensor Circuit
P0485   Cooling Fan Power/Ground Circuit
P0805   Clutch Position Sensor Circuit
P0896   Shift Time Too Long




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