I have a '98 mazda b2500. The check engine light would come on, go off, come on, go off. Then came on and stayed. I got my truck diagnosed ($78). Then replaced the egr valve ($40). This worked for about 3 months. now the light is on full time, till a week ago. I filled up with premium gas and the light went out for 3 days. So I filled up with premium again with no result.

If anyone has any comment.

Thanks

I was told that under dash around kick panel, theres 2 wires, 1 black, and 1 blue, 1 is pluged in, take it out, and plug the other 1 in. hope this works for you.and you can take off neg. side of battery for 10 sec. and put back on.