DTC Questions 1131 - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 07-31-2010 Thread Starter
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DTC Questions 1131

My check engine light has been on about a week now with no differences in performance. I pulled the code 1131 which gives a several possibilities. I noticed right before the light came on and after I got the light turned off while going "WOT" is when the light came on, but again no differences in performance.

One more thing, when you undo the cap and look down the filler, there is a thin metal "flap" which I assume is for splashing and backfilling of the tank to prevent overflow out the neck. My flap is completely gone. The previous owner somehow messed it up. It sucks whenever I'm filling the car up the gas pump will stop every few gallons, but anyhow could this be causing the issue?

Thanks for all the replies and help!

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post #2 of 6 (permalink) Old 08-01-2010
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Post code help

P1131 = you may have an O2 sensor failing or wiring fault.

See attachment below.

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File Type: txt P1131 code help from Ford Service DVD.txt (4.6 KB, 86 views)
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post #3 of 6 (permalink) Old 08-01-2010 Thread Starter
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Quote:
Originally Posted by grn 00 gt View Post
P1131 = you may have an O2 sensor failing or wiring fault.

See attachment below.

I understand that part. When I took it to get the codes read I was told and also researched myself it could be several reasons other then the 02 Sensor. From the research that I've done indicates it could be as simple as a gas cap which lead me to think the flap missing could possibly be the cause. I'm just guessing.
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post #4 of 6 (permalink) Old 08-01-2010
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I would go with the easy checks first on the list and mark off the ones you have already done.

If the car has high milage on the original O2 sensors, I would try that next.

The gas flap is a splash guard and won't cause the code.
Having a bad gasket on the gas cap will send a different code for the EVAP system, so you cap gasket is fine.
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post #5 of 6 (permalink) Old 08-01-2010 Thread Starter
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Quote:
Originally Posted by grn 00 gt View Post
I would go with the easy checks first on the list and mark off the ones you have already done.

If the car has high milage on the original O2 sensors, I would try that next.

The gas flap is a splash guard and won't cause the code.
Having a bad gasket on the gas cap will send a different code for the EVAP system, so you cap gasket is fine.

Thanks a lot, that helps....
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post #6 of 6 (permalink) Old 08-03-2010
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I had same code, Swapped O2 sensors left & right & reset, code came back on other side 1151, so faulty sensor, changed and code not returned

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