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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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

P0661 P0661

P0748 intermitant loss of powe. when i take off very sluggish then picks up to normal. doesnt do it all the time

P0144 Engine shake when you are stop on idle

P0481 Chrysler PT Cruiser
code p0481


P0324 Check engine light is on



Other Check Engine Light Codes

P0134   O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0139   O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0313   Misfire Detected with Low Fuel
P0356   Ignition Coil 'F' Primary/Secondary Circuit
P0371   Timing Reference High Resolution Signal 'A' Too Many Pulses
P0417   secondary Air Injection System Switching Valve 'B' Circuit Shorted
P0524   Engine Oil Pressure Too Low
P0604   Internal Control Module Random Access Memory (RAM) Error
P0859   Traction Control Input Signal High
P0879   Transmission Fluid Pressure Sensor/Switch "D" circuit Intermittent




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