EGR Flow Excessive(P0402) error on 97 Taurus GL

[gamo62]

I've thrown a P0402 error on my 97 Taurus GL. The car seems to be running fine. The code randomly comes on and then goes off. (Or at least the Service Engine Soon indicator does.)

Is this something to worry about? The only change that was made was adding a locking fuel cap. I know that troubleshooting this can be an extensive process. And if there is something that is causing the Taurus to throw the P0402 code, I do want to get it taken care of. Any suggestions? Thanks.

[shorod]

Welcome to the forum!

You might try the "Search this forum" feature from the Taurus forum main page. There have been several posts related to P0402 with quite a few suggestions on items to check.

-Rod

[brunnj]

Originally Posted by gamo62

I've thrown a P0402 error on my 97 Taurus GL. The car seems to be running fine. The code randomly comes on and then goes off. (Or at least the Service Engine Soon indicator does.)

Is this something to worry about? The only change that was made was adding a locking fuel cap. I know that troubleshooting this can be an extensive process. And if there is something that is causing the Taurus to throw the P0402 code, I do want to get it taken care of. Any suggestions? Thanks.

Sounds like it could be the DPFE sensor (EGR pressure feedback sensor). Usually if it's bad you'll notice a "bucking" around 45 mph. Good luck.