diagnostic help please...'93 sable 3.8
 

Hi - Any help is appreciated. I have a

1993 sable 3.8

It runs fine (no noticeable problem) except that the check engine light goes on occassionally. I pulled the codes for KOEO and they are:

Current Code - 335: EGR sensor circuit voltage higher or lower than expected

Memory Codes - 57: neutral pressure switch circuit fault; 332: Insufficient EGR flow

For about a year now, the lamp would go on if I went down hill for a few minutes, but would then go out once I was climbing or on flat ground. I didn't notice any problems besides that, and it was so infrequent, that I ignored it. The light goes on and off daily now.

Do you think this might be a bad EGR valve or...?

(Funny thing is that it just passed smog (CA) no problem!)

Thx!

RE: diagnostic help please...'93 sable 3.8
 

The DPFE sensor has probably failed. Also check the two hoses that go to it.

RE: diagnostic help please...'93 sable 3.8
 

Yes, it was the DPFE sensor. $42 at kragen. Thanks!