740 check engian light need help please
 

hello all i own a 1991 740 and i keep getting a check engien light is there a easy why to find out what is wrong with it ... it is on for 3 drives then off for 3 drives please help need to get it to pass inspection

RE: 740 check engian light need help please
 

there is a little black box on the drive side strut tower:
https://volvoforums.com/upfiles/1643...9CA0EB1887.jpg

Pull the codes, if any, and report back. here is how to check for codes: http://www.troublecodes.net/Volvo/

RE: 740 check engian light need help please
 

thanks i will try that where is the selector cable ??

RE: 740 check engian light need help please
 

The cable should be attached by a cable to the inside of the little box.

If your check engine light keeps coming on then it is telling something:D.

Depends on what your doing prior to the light coming on.
For example: I went to get gas the other day...and I filled her up with 91 and I drive out of the lot and BAM! check engine light. I pul the code 1-4-3, which is the knock sensor, but it was just some bad mixture of gas which set it off. A couple weeks and still no light.

RE: 740 check engian light need help please
 

i checked my codes and it has 2 .... 2-2-1 and 2-3-3

i read the page you sent me what you think i need to do ???