Hey all,
I saw a few other threads with P0172, but the original posters never came back and said what fixed their issues. So, this is more for anyone that comes across this for later, as I'll keep it updated. Note that these codes are pending, and my car never had a CEL.
Symptoms: Power loss on the highway, trouble idling, and trouble returning to idle.
Measurements: When in cruise, car lost all power momentarily, then retuned. During this power loss, primary O2 read 11:1. A quick run to red line shows no symptoms, pulls fine with no issues in 2nd, 3rd with normal afrs in the rich range from the stock tune. This also will temporarily fix the power loss , and reading primary O2, it'll run mid 14s ...the...drop to 11 and instant power loss, all while in cruise.
At idle, it will struggle to maintain. When it idles fine, primary O2 reads upper 14s, then it'll instantly drop to 11 and the idle will get chunky. Note that smell from exhaust at this time does not smell rich.
Cat temps are normal, 1600 on a 75mph cruise.
Car: 2005 GT, 150k miles with 51k on a reman. Ls2 coils really the only engine mod. Plugs have less than 5k miles. Cat recently checked and looked fine.
Suspect: Primary O2 failure.
I have an extra OE one, will replace and update here.
If anyone else would like to add, please do!
I saw a few other threads with P0172, but the original posters never came back and said what fixed their issues. So, this is more for anyone that comes across this for later, as I'll keep it updated. Note that these codes are pending, and my car never had a CEL.
Symptoms: Power loss on the highway, trouble idling, and trouble returning to idle.
Measurements: When in cruise, car lost all power momentarily, then retuned. During this power loss, primary O2 read 11:1. A quick run to red line shows no symptoms, pulls fine with no issues in 2nd, 3rd with normal afrs in the rich range from the stock tune. This also will temporarily fix the power loss , and reading primary O2, it'll run mid 14s ...the...drop to 11 and instant power loss, all while in cruise.
At idle, it will struggle to maintain. When it idles fine, primary O2 reads upper 14s, then it'll instantly drop to 11 and the idle will get chunky. Note that smell from exhaust at this time does not smell rich.
Cat temps are normal, 1600 on a 75mph cruise.
Car: 2005 GT, 150k miles with 51k on a reman. Ls2 coils really the only engine mod. Plugs have less than 5k miles. Cat recently checked and looked fine.
Suspect: Primary O2 failure.
I have an extra OE one, will replace and update here.
If anyone else would like to add, please do!
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