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Thread: P0420 code!
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07-07-2010, 05:51 PM #1
P0420 code!
My Car's "Service Engine Soon" light came on today so I barrowed a friend's OBD-II code reader. It's throwing a P0420 code, which I think is for the O2 sensors having different readings. I know that there was a voluntary GM recall on the cats on the cars, do you guys think that is the problem or did my O2 sensor take a dump on me? I wasn't driving it hard or anything when it came on. The engine was at 2000 RPM when it came on.
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07-07-2010, 07:26 PM #2
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1999 Formula WS6 M6-sold- 2001 Silverado Z71
Its a bad cat converter
http://www.ls1.com/forums/showthread.php?t=86065
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07-07-2010, 07:42 PM #3
is my car under warranty still do you think?? it only has 72K on it.
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07-07-2010, 07:52 PM #4
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1999 Formula WS6 M6-sold- 2001 Silverado Z71
post your VIN number and I'll let you know.
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07-07-2010, 07:54 PM #5
2g1fp22g7y2135720
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07-07-2010, 08:06 PM #6
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1999 Formula WS6 M6-sold- 2001 Silverado Z71
well unfortunately the GMVIS doesn't list the "Delivery Date" for your VIN so I can't tell you for sure. You're right at that 10 year expiration though so depending on when your car was delivered when it was new, it could be in or out of warranty.
But your VIN does fall in the VIN breaks for the special policy and so does your mileage. So the only thing that could disqualify you would time.
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07-07-2010, 08:09 PM #7
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1999 Formula WS6 M6-sold- 2001 Silverado Z71
Looks like all of the warranty work that was done to the car was done at PARADISE CHEVROLET in TEMECULA, CA so maybe you should call them and see if its still under the Cat converter Special Policy.
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07-07-2010, 08:15 PM #8
My car was made in December of 99 so I'm guessing it's all done. :/
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07-07-2010, 09:19 PM #9
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Black- 00 camaro ss M6 #6695
My car has the same problem
When it had 114k miles gm had to replace one of the cats
I was told by the previous owner
That was 18 months ago
He had 1 year warranty on the cay
And now it has 120k miles
And the same cat is messed up again
The warranty is over
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07-07-2010, 10:08 PM #10
So, let's say it is my cat, and I just got my car smogged. If I'm too lazy to replace the cat will it mess up my car?
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07-07-2010, 10:39 PM #11
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Black- 00 camaro ss M6 #6695
I dnt think it will messed up your car.
It could make a noyse inside the cat that's it
Mine does it. I hate it
How did you passed your smog if you need a new cat?
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07-07-2010, 10:42 PM #12
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07-07-2010, 11:23 PM #13
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Black- 00 camaro ss M6 #6695
Ohh ok
I tought u had it done recently
So you need the o2 sensor too?
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07-07-2010, 11:55 PM #14
No idea. I'll find out tomorrow when i go to the dealer with it.
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07-08-2010, 12:04 AM #15
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Black- 00 camaro ss M6 #6695
Let us knw wat it is cuz I had da same code on my car
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07-08-2010, 04:25 PM #16
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07-08-2010, 05:17 PM #17
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07-08-2010, 05:44 PM #18
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1999 Formula WS6 M6-sold- 2001 Silverado Z71
yep, then you are out of warranty by about 6 months and a week
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07-08-2010, 06:42 PM #19
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07-08-2010, 07:06 PM #20
take all the paperwork along with the special bulletin number and a sack full of cheesburgers to the dealership just before lunchtime.
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