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 Vibrate? Shake?
Does your Car Idle Roughly? Reduced Power?

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Other Comments

P0884 800884b

P0298 running hot replaced raidiator and fan clutch

P0616 Sea Doo GTX
battery test good don't start


P0616 will not start battery test good

P0140 Aerocar
kNm9up You have a number of truly of the essence in a row printed at this point. Excellent job and keep reorganization superb stuff.




Other Check Engine Light Codes

P0024   'B' Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
P0130   O2 Sensor Circuit (Bank 1 Sensor 1)
P0268   Cylinder 3 Injector Circuit High
P0431   Warm Up Catalyst Efficiency Below Threshold (Bank 2)
P0434   Heated Catalyst Temperature Below Threshold (Bank 2)
P0523   Engine Oil Pressure Sensor/Switch High Voltage
P0712   Transmission Fluid Temperature Sensor Circuit Low Input
P0792   Intermediate Shaft Speed Sensor Circuit Range/Performance
P0834   Clutch Pedal Switch 'B' Circuit Low
P0915   Gear Shift Position Circuit Range/Performance




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