What needs fixed for a code 31

ANTONY CONNER

MEMBER
1991 FORD MUSTANG
5.0L
V8
RWD
AUTOMATIC
89,000 MILES

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?

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
43,047 POSTS

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

What needs fixed for a code 31

1 Reply

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