what needs fixed for a code 31

1991 FORD MUSTANG
89,000 MILES • 5.0L • V8 • RWD • AUTOMATIC
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ANTONY CONNER
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i read the codes and got a code 31 the scanner said 1.(cars only) EVAP or PFE circuit below minimum voltage 2. (trucks only) EGR valve control sensor fault (ex. v8 models) 3.(trucks only) EVAP control system below minimum voltage. so my question is what do i need to fix this problem on my car?
Feb 19, 2017 at 7:15 PM
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Hey ANTONY,

There is a EGR pressure sensor that goes out becasue of a particularly plugged catalytic converter. Check the bottom of the sensor to see if its burned out.

Here is a guide to replace the cat if that what the problem is.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

and

https://www.2carpros.com/articles/catalytic-converter-replacement


Please run some tests and get back to us so we can continue helping you.

Best, Ken

Feb 22, 2017 at 2:14 PM