Check Engine Light

[defender1844]

It says the wiring harness is bad. The truck runs fine. Any advice on how to diagnose and fix this problem?

[jimmy salmon]

if it runs fine then its not broke, don't fix it

[defender1844]

I can't get a sticker with a check engine light in Texas.

[JimC]

Kill a chicken and take out the bulb?

[defender1844]

I think big brother's emissions checking machine interfaces with the ECU and knows that the check engine light is on. Come on guys, someone must have had this problem.

[evilfij]

Is it a 1994/95 or a 1997?

[jimmy salmon]

94's don't need to be hooked up, not sure obout 95/97

[evilfij]

Pre 1996, no OBD II can't hook them up to the machine.

[defender1844]

It's a 97. Should have clarified that.

[evilfij]

What is the exact code? It is O2 sensor shorted?