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  #1  
Old 02-17-2011, 06:05 PM
ZWilson07 ZWilson07 is offline
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Default Code P0420

I checked it on my scangauge, im assuming from google seearches that its an O2 sensor or cat? Anyone else came across this, search only came up with 1 way back in the day.
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  #2  
Old 02-17-2011, 06:13 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: Code P0420

yep 02 sensor or Cat. Most commonly o2 sensor.
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Old 02-17-2011, 06:20 PM
ZWilson07 ZWilson07 is offline
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Default Re: Code P0420

should I just go to autozone and have them run it to see exactly what 02 sensor it is or what.
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Old 02-17-2011, 06:22 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: Code P0420

If you feel like you dont know what it is then yes, have you replaced any o2 sensor or cat before?
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  #5  
Old 02-17-2011, 06:25 PM
ZWilson07 ZWilson07 is offline
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Default Re: Code P0420

nope never had to
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  #6  
Old 02-17-2011, 06:34 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: Code P0420

Id get a Diagnostic run on it.
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  #7  
Old 02-17-2011, 06:38 PM
ZWilson07 ZWilson07 is offline
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Default Re: Code P0420

from where just autozone and them that have the scanners?
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  #8  
Old 02-17-2011, 07:40 PM
ZWilson07 ZWilson07 is offline
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Default Re: Code P0420

from where just autozone and them that have the scanners?
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  #9  
Old 02-18-2011, 08:00 PM
ZWilson07 ZWilson07 is offline
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Default Re: Code P0420

can you get diagnostics ran at like autozone and them pinpoint like what O2 sensor or so might be malfunctioning or do you have to go to a dealer?
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  #10  
Old 02-18-2011, 08:14 PM
brobes600 brobes600 is offline
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Default Re: Code P0420

you can go to autozone and you should be lookn for a bank 1 or 2 code. but all data states
p0420- catalyst system efficiency below threshold (bank 1).
it is sayin that the 02 sensor is either damaged or high fuel pressor or misfire. ur best bet might be to replace it and see what you get. or just take a look at it and see if it is damaged or clogged up with shit.
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  #11  
Old 02-18-2011, 08:26 PM
turbographx turbographx is offline
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Default Re: Code P0420

Autozone can tell you which o2.
The scanner will say either A, B, C, D as below or any combination of the A, B, C and D.

A: "Bank One, Sensor One" Which would be driver side upstream sensor. (Before the Cat.)
B: "Bank One Sensor Two" Which would be driver side downstream sensor. (After the Cat.)
C: "Bank Two Sensor One" Which would be passenger side upstream sensor. (Before the Cat.)
D: "Bank Two Sensor Two" Which would be passenger side downstream sensor. (After the Cat.)

Due to it being a 420 in the code, we already know that it is bank one, so rule out C and D above.

O2 code can also be thrown by:
Retarded Ignition timing.
Leaking Exhaust Manifold or any exhaust joints upstream of the O2 sensor.
Bad or faulty engine coolant temp sensor.
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