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

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Other Comments

P0340 Saab 9-3
Hard Cold Start issues PO340 code replaced sensor same issue. Saab garage reckon it is a worn sprocket at the crank shaft pulley which has thrown the timing causing hard ignition when cold, checked valve timeing said it was off starts fine when heated up eveytime.


P0793 The cvt transmission is hard to shift, it jerks and the check engine like comes on. Where should I check next. Where is the senser located, in the vavle body?

P0510 Daewoo Lanos
p0510 p1513


P0851 Fhuu

P0351 p0351



Other Check Engine Light Codes

P0072   Ambient Air Temperature Sensor Circuit Low Input
P0248   Turbo/Super Charger Wastegate Solenoid 'B' Range/Performance
P0268   Cylinder 3 Injector Circuit High
P0311   Cylinder 11 Misfire Detected
P0324   Knock Control System Error
P0487   Exhaust Gas Recirculation Throttle Position Control Circuit
P0713   Transmission Fluid Temperature Sensor Circuit High Input
P0731   Gear 1 Incorrect Ratio
P0793   Intermediate Shaft Speed Sensor Circuit No Signal
P0904   Gate Select Position Circuit




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