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#1
07-08-2009, 03:15 PM
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Check Engine light
I have a 2001 grand prix gt 3.8 n/s. The check engine light comes one its for a oxygen sensor bank 1 code. I replaced it and it went off every other day it comes back on. I purchased a new IACV, MASS air flwo (they both needed it ). car runs great but the light comes on i turn it off and it comes back on. I did just have the converter replaced about 6,000 miles ago could that have anythign to do with it.
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#2
07-08-2009, 05:44 PM
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Re: Check Engine light
When the light comes on, has it been the bank 1 O2 sensor every single time or are there any other codes at all?
__________________
  2000 Pontiac Grand Prix GTP 3.8L SII V6 S/C 2000 Jeep Grand Cherokee Limited 4.7L V8 ---------------------------------------------------- 1996 Chevrolet Camaro Z28 5.7L V8 1993 Chevrolet Suburban K1500 5.7L V8 1991 Ford Probe LX 3.0 V6 1986 Ford Tempo GL 2.3L 4 cyl.
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#3
07-08-2009, 06:02 PM
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Re: Check Engine light
WHat is the specific code that pops up?
P0420?
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#4
07-09-2009, 03:35 PM
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Re: Check Engine light
yes p0420 is the code. Thats the only one that comes on. It came on again today i shut it off drove home about 20-25 miles and it kicked back on. I called the shop they told me there was no way the cat was bad since it is only 3 months old. ANy ideas
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#5
07-09-2009, 04:38 PM
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Re: Check Engine light
P0420 Catalyst System Efficiency Below Threshold
This indicates the difference between the readings from the pre and post cat oxygen sensors is below what the PCM's programming indicates it should be. This could be caused by a few different issues. 1. You had a cheap universal weld-in converter installed and it isn't efficient enough to meet OEM specs 2. Your new upstream oxygen sensor is junk (Bosch brand by chance?) 3. Your post cat oxygen sensor is carboned up, and no longer able to match the new upstream sensor's performance, thus tripping the P0420 code, but not bad enough to trip a post-cat sensor code. There are other variables that could cause this condition as well, but these 3 are the most likely.
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 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#6
07-09-2009, 06:06 PM
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Re: Check Engine light
okay. Know what kind of oxygen sensor should i get and if i dont change it right away what is the drivability of the car. My question what does a bad oxygen sensor do besides hurt the gas millage and eventually the CAT.
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#7
07-10-2009, 01:31 AM
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Re: Check Engine light
It is more expensive but get the GM brand. You will be better off usually with a GM part over a non GM part.
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#8
07-10-2009, 10:00 AM
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Re: Check Engine light
I agree with Doc, get an AC-Delco to avoid all the possible aftermarket junk hassles.
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Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#9
07-10-2009, 07:50 PM
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Re: Check Engine light
X3, I've had so many issues with aftermarket junk. However GM quality has been questionable recently also.
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#10
07-12-2009, 06:15 PM
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Re: Check Engine light
Quote:
__________________
2000 Pontiac Grand Prix GTP 3.8L SII V6 S/C 2000 Jeep Grand Cherokee Limited 4.7L V8 ---------------------------------------------------- 1996 Chevrolet Camaro Z28 5.7L V8 1993 Chevrolet Suburban K1500 5.7L V8 1991 Ford Probe LX 3.0 V6 1986 Ford Tempo GL 2.3L 4 cyl.
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