what to do about codes?
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Joined: Feb 2008
Posts: 69
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From: AUSTIN TX.
what to do about codes?
OK guys I have 3 codes. #1 is PO171, #2 is PO174 and #3 is PO621. I checked for vacuum leaks everywhere and found none. I found bosch and denso O2 sensors on Ebay and Amazon for as little as $25.00 each shipped. I have the tools for changing the sensors and I'm ready to order the parts and go to work but that still leaves PO621 Gen Lamp L control circuit. code. My local repair shop wants to change the 4 O@ sensors and go from there. What do you experts think? Vette runs great no change.
Race Director
Joined: May 2004
Posts: 16,667
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From: Raleigh, NC
St. Jude Donor '15
I don't buy O2 sensors going bad on both banks at the same time.
Stock tune or no?
If you want to replace them just buy some AC Delco ones off Amazon. That's what I'm using. I don't think they are the root of the problem though based on the limited info you've posted.
Stock tune or no?
If you want to replace them just buy some AC Delco ones off Amazon. That's what I'm using. I don't think they are the root of the problem though based on the limited info you've posted.
Last edited by schpenxel; Apr 5, 2016 at 10:19 PM.
Thread Starter
Advanced
Joined: Feb 2008
Posts: 69
Likes: 0
From: AUSTIN TX.
OK guys I have 3 codes. #1 is PO171, #2 is PO174 and #3 is PO621. I checked for vacuum leaks everywhere and found none. I found bosch and denso O2 sensors on Ebay and Amazon for as little as $25.00 each shipped. I have the tools for changing the sensors and I'm ready to order the parts and go to work but that still leaves PO621 Gen Lamp L control circuit. code. My local repair shop wants to change the 4 O@ sensors and go from there. What do you experts think? Vette runs great no change.
Le Mans Master
Joined: May 2016
Posts: 7,147
Likes: 1,546
From: Florida
It is so tempting to take the shotgun parts replacement route, but not good especially if you're paying a shop to do so. With codes, the answer is there with intelligent diagnostic techniques.
