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General(!) question about MIL and trouble codes #1385701 09/14/05 02:15 AM
Joined: Jun 2000 Posts: 768 Lyndhurst, NJ A alex_96GL_dup1 OP Veteran CEG\'er
OP alex_96GL_dup1 Veteran CEG\'er A Joined: Jun 2000 Posts: 768 Lyndhurst, NJ	OK, I have no CE light, but if I hook up my scanner I see "MIL is off", trouble codes found P1131 (it's "Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1." for those interested) so the question is: how is this even possible, why would it have the trouble code stored (not pending code!), but decide not to fire up the light? --alex \| 98 SE V6 MTX w/ things

Re: General(!) question about MIL and trouble codes #1385702 09/14/05 02:59 AM
Joined: Jun 2005 Posts: 5,345 Virginia, USA T Tony2005 Addicted CEG\'er
Tony2005 Addicted CEG\'er T Joined: Jun 2005 Posts: 5,345 Virginia, USA	Originally posted by alex_96GL: OK, I have no CE light, but if I hook up my scanner I see "MIL is off", trouble codes found P1131 (it's "Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1." for those interested) so the question is: how is this even possible, why would it have the trouble code stored (not pending code!), but decide not to fire up the light? Bulb is burnt out. You may want to replace it. Edit. Link to Instrument Panel Lights. http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=1013009&Forum=trouble&Words=instrument%20panel&Match=Entire%20Phrase&Searchpage=0&Limit=25&Old=3months&Main=1012899&Search=true#Post1013009 and P1131 issue. http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=1036833&Forum=trouble&Words=p1131&Match=Entire%20Phrase&Searchpage=0&Limit=25&Old=allposts&Main=1036785&Search=true#Post1036833 And yes, this post should be in Troubleshooting. Last edited by Tony2005; 09/14/05 03:05 AM. "Always do the cheap and easy ones first." 1996 V6 ATX 96K miles

Re: General(!) question about MIL and trouble codes #1385703 09/14/05 03:04 AM
Joined: Jun 2000 Posts: 768 Lyndhurst, NJ A alex_96GL_dup1 OP Veteran CEG\'er
OP alex_96GL_dup1 Veteran CEG\'er A Joined: Jun 2000 Posts: 768 Lyndhurst, NJ	bulb is fine and even if it were burned out auto x-ray would say that MIL is on, if computer thought it was on. I know what 1131 is, and have a fair idea as to why it's on. thanks for the effort Last edited by alex_96GL; 09/14/05 03:06 AM. --alex \| 98 SE V6 MTX w/ things

Re: General(!) question about MIL and trouble codes #1385704 09/14/05 03:20 AM
Joined: Jun 2005 Posts: 5,345 Virginia, USA T Tony2005 Addicted CEG\'er
Tony2005 Addicted CEG\'er T Joined: Jun 2005 Posts: 5,345 Virginia, USA	Originally posted by alex_96GL: thanks for the effort Always glad to help a fellow CEGer. "Always do the cheap and easy ones first." 1996 V6 ATX 96K miles

Re: General(!) question about MIL and trouble code #1385705 09/14/05 06:43 AM
Joined: Jul 2005 Posts: 301 Wisconsin R rearden CEG\'er
rearden CEG\'er R Joined: Jul 2005 Posts: 301 Wisconsin	I have a 1131 code as well at the moment. At first the CEL was only on occasionally. It would be there one day, gone the next 2 or 3 days, come back, etc. O2 sensors can go out gradually as they begin responding more slowly. My guess is that the computer has a lower threshold where it stores a code and a higher one where it illuminates the CEL, and mine was right on the border. '99 Contour Sport V6 MTX

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