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Check Engine light on -- code P1131 #691329 07/14/03 02:29 PM
Joined: Nov 2002 Posts: 12 Mobile, AL A annakoby OP New CEG\'er
OP annakoby New CEG\'er A Joined: Nov 2002 Posts: 12 Mobile, AL	Hello all! The check engine light came on at 54,000 miles on my 1998 Contour LX (V6 2.5L engine). I took it to AutoZone and they gave me the following "dealer specific" code: P1131. When I called the dealership, they said they would only tell me what it meant after I brought it in and let them diagnose it -- for $74! I did not say "No" but rather "Hell No!" Using the wonderful resources on this website, I've found out that this code is: "Lack of upstream heated oxygen sensor switch -- Sensor indicates lean." Can anyone please provide information as to what kind of work is required to resolve this? Any and all assistance would be greatly appreciated. 1998 Contour LX V6 2.5L

Re: Check Engine light on -- code P1131 #691330 07/14/03 02:55 PM
Joined: Nov 2002 Posts: 392 Omaha B Baby SHO CEG\'er
Baby SHO CEG\'er B Joined: Nov 2002 Posts: 392 Omaha	New oxygen sensor! 1998 SVT

Re: Check Engine light on -- code P1131 #691331 07/14/03 03:08 PM
Joined: Nov 2002 Posts: 12 Mobile, AL A annakoby OP New CEG\'er
OP annakoby New CEG\'er A Joined: Nov 2002 Posts: 12 Mobile, AL	Thanks. I found out that there are 4 O2 sensors on the engine, ranging in cost but averaging around $90. Does anyone know how we could determine which of the 4 has failed (as far as checking voltage, what the voltage should be, is there a visual inspection, etc). 1998 Contour LX V6 2.5L

Re: Check Engine light on -- code P1131 #691332 07/14/03 03:57 PM
Joined: Sep 2002 Posts: 1,788 St. Louis, MO P projectSHO89_dup1 Hard-core CEG\'er
projectSHO89_dup1 Hard-core CEG\'er P Joined: Sep 2002 Posts: 1,788 St. Louis, MO	A further search on P1131 will give you all the answers you seek. Steve 98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!

Re: Check Engine light on -- code P1131 #691333 07/14/03 04:02 PM
Joined: Aug 2002 Posts: 506 L LI-SVT Veteran CEG\'er
LI-SVT Veteran CEG\'er L Joined: Aug 2002 Posts: 506	P1131 is bank 1 upstream sensor not switching. 99.9% sure it is just the sensor. '98.5 SVT E1 T-Red, Midnight Blue All stock

Re: Check Engine light on -- code P1131 #691334 07/14/03 04:05 PM
Joined: Nov 2002 Posts: 12 Mobile, AL A annakoby OP New CEG\'er
OP annakoby New CEG\'er A Joined: Nov 2002 Posts: 12 Mobile, AL	This is what my search found: P1131 is the rear bank(by firewall) upstream/ before the cat. HO2S11! it is a indicates lean code but if your car runs good still you should replace that O2 sensor(HEGO). and i would recommend replacing both upstreams with bosch to $60 a piece. Is that what you were referring to? Thanks a million! ~Anna 1998 Contour LX V6 2.5L

Re: Check Engine light on -- code P1131 #691335 07/14/03 04:30 PM
Joined: Mar 2002 Posts: 2,319 Pickering, Ontario, Canada H horseydug_dup1 Hard-core CEG'er
horseydug_dup1 Hard-core CEG'er H Joined: Mar 2002 Posts: 2,319 Pickering, Ontario, Canada	More reading: P1131 Two Techies Talking Re-setting PCM and seeing if code returns is sometimes a wise move, if you have a code reader or free access thereto. Edit: Italics phrase added. Last edited by horseydug; 07/14/03 04:57 PM. 98 Mystique LS v6 atx 163,000km 97 Contour LX v6 atx 163,000km

Re: Check Engine light on -- code P1131 #691336 07/14/03 04:31 PM
Joined: Aug 2002 Posts: 506 L LI-SVT Veteran CEG\'er
LI-SVT Veteran CEG\'er L Joined: Aug 2002 Posts: 506	Thats the one. As with many cars the Contour O2 sensors can fail. The car may seem to be running ok but in fact the A/F trim can be out with a bad o2 sensor. Fix it as soon as possible. Bosch should be fine. If you have acess to an OBD II scanner you can check the operation of all the O2 sensors to see if they are working. '98.5 SVT E1 T-Red, Midnight Blue All stock

Re: Check Engine light on -- code P1131 #691337 07/14/03 05:11 PM
Joined: Nov 2002 Posts: 12 Mobile, AL A annakoby OP New CEG\'er
OP annakoby New CEG\'er A Joined: Nov 2002 Posts: 12 Mobile, AL	You guys rock! Thanks so very much for all of your help! I'm definitely going to make this my first stop whenever I encounter any problems with my car. Thanks again! ~Anna 1998 Contour LX V6 2.5L

Re: Check Engine light on -- code P1131 #691338 07/14/03 05:32 PM
Joined: Mar 2002 Posts: 2,319 Pickering, Ontario, Canada H horseydug_dup1 Hard-core CEG'er
horseydug_dup1 Hard-core CEG'er H Joined: Mar 2002 Posts: 2,319 Pickering, Ontario, Canada	It's P1131 day: click & read 98 Mystique LS v6 atx 163,000km 97 Contour LX v6 atx 163,000km

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