Question about Ford F-250

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Is there a check engine light in a 1991 ford F250

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Yes, the truck has an OBD system onboard. Look under dash, there should be a connector there for scanner. Connector is about 2 inch by 1/2 inch. Not sure where the indicator is--somewhere on instrument panel--may go by a different name.

Posted on Sep 03, 2010

  • Chuck
    Chuck Dec 12, 2010

    1991 is OBD I and the connector is NOT under the dash- that one is OBD II. the OBD I connector is in the engine compartment.


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Yes yours may be burned out if it has been glowing the night away for many years. your system is a obd1

Posted on Sep 03, 2010


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My 1991 Ford F250 headlights stopped working. Fuse is good and replaced headlight switch, still no power to headlights. Help!!!

You would need a trouble light to check and see if there is a problem with the ground or the hot wire leading to the lights. There is most likely a relay to the headlights under the dash or in the engine compartment. Check the area of the fusebox for it.

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I have a 1991 ford f 250 van engine light is on when i drive it engine light gos off and on when it comes back on the truck will hesitate what will cause that

You'll have to do a scan on the computer to find the trouble codes.
Your model can be done without a scan tool, research "check OBD 1 code Ford" online for the procedure, or you can find it in most repair manuals.

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1991 Ford F250 Brake and signal indicators do not work

You're in the right ball park.
You should have voltage from the brake switch into the turn signal switch and then out to the lights.
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Check engine light on

need more info.

you can go to most chain parts stores like autozone and they will scan for codes for free

Feb 06, 2010 | 1991 Ford F250

1 Answer

Check engine light. 91 ford F250 5.8

Yes you can use a piece of wire on the Diagnostic Link Connector and the Self Test Input connector.
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