PO125 and PO170

[Tatum'sGST]

Hi, Driving around today when the CEL comes on my 98GST.
After a visit to Autozone the following codes were diagnosis PO125 and PO170. Does anyone have knowledge on repairs to correct the problem, and is it possible that just one of the codes is at fault for both errors?

I thank everyone in advance for your help and comments.

 

[L2RTSiAWD]

http://www.troublecodes.net/OBD2/Pcodes.shtml

 

[L2RTSiAWD]

P0125-Insufficient Coolant Temperature for Closed Loop Fuel Control;
ECT Excessive Time to Closed Loop Fuel Control

P0170-Fuel Trim Malfunction (Bank 1)

 

[Doug99RS]

Replace your thermostat and drive it again.
Doug

 

[Tatum'sGST]

Update - Replaced thermostat which didn't fix problem. CEL came back on within 5 miles. So next I decided to replace both the Coolant Temperature Sensor and Oxygen Sensor since the car has 75,000 miles and once this was done it was fixed . No more PO125 for now. This also fixed the idle and the felt surge during 40 - 50 mph.

Also found one injector connection loose. This may have caused the PO170 error.


Once again thanks everyone for your reply's and help.

This is a great site full of good information and good people .

 

[Doug99RS]

Sorry I led you in the wrong direction on that one. Thanks for the update and I'll try and remember that fix in the future.
Doug

 

[doodie]

Originally posted by L2RTSiAWD
http://www.troublecodes.net/OBD2/Pcodes.shtml

Great site! why didn't you bring it up earlier?

 

[Doug99RS]

The site's been copywrited since 2001. It's been there for a while for those that know how to search.