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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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

P0846 Try's to shift than goes to second and stays there.? Limp mode. Changed the speed sensor input and outpu. 700 code first now 846

P0840 Mitsubishi
i'm having Mitsubishi delica D5 problem with reduced power error code is showing p0840 kindly help


P0884 P0884

P0717 no work to fix it what to fix

P0121 Nissan Quest
P0120




Other Check Engine Light Codes

P0108   Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0147   O2 Sensor Heater Circuit (Bank 1 Sensor 3)
P0328   Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
P0353   Ignition Coil 'C' Primary/Secondary Circuit
P0386   Crankshaft Position Sensor 'B' Circuit Range/Performance
P0731   Gear 1 Incorrect Ratio
P0732   Gear 2 Incorrect Ratio
P0733   Gear 3 Incorrect Ratio
P0762   Shift Solenoid 'C' Stuck On
P0787   Shift/Timing Solenoid Low




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