I have a 2001 Sable V-6 (69,000 miles) with a check engine light and had a
friend run a diagnostic on it. It came back with 2 codes PO401 & PO402,
which is an EGR flow code. My buddy said he checked and reset the codes and
$65 and about 5 hrs. later the check engine light is back on. Any
suggestions on this. Should I just go for a new valve ($$$$) or is there a
sensor or vacum leak????? If this has a common fix let me know or should I
take it back into the shop??? If it is an easy fix I'd like to try it
Learn how to reset the codes yourself. You could have saved yourself
that $65 if you knew how to do it. On one of my cars all you needed
was a paperclip to close the circuit. Also depending you can also
read the codes yourself manually via paperclip and counting the blinks
of the check engine light as you go along the procedure to retrive the
You are kidding, right..P0401 , and P0402 at the same time..??? Go back to
your buddy or whatever he/she is and ask for the return of your $65, and go
get yourself a manual. You can diagnose the cause with a digital multimeter
and a vacuum pump.The most likely problem is a bad DPFE sensor. The cost run
about $70 from the dealer. Removal and installation takes about 15 minutes
with time to spare.
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