Code 172 after O2 replacement
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Freshman User
Joined: Jan 2001
Posts: 26
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Code 172 after O2 replacement
Good morning,
I read the code from my 93 F150,4X4, 351 and it was 172 (lean). The truck has 112K miles and the O2 sensor has never been changed so I replaced it. After a few weeks the code came back.
I was going to check the fuel pressure over the weekend but only have the GM connector on my fuel gauge. Since it is relatively easy, I replaced the fuel filter since it had been awhile and I still have the 172 code. I had my fuel pump replaced about 2 years ago. Has anyone had this problem? Is the next step to test the fuel pressure?
The truck runs fine and gets about 15 miles/gal. The code only comes on after about 8 miles of driving and stays on until the truck is shut down. I never seem to get lucky just replacing parts and I'm up to my ears in wrenching on my Vette. Can anyone let me know what worked for them?
I have an aftermarket chip in the truck for whatever it's worth. I'm sure not many parameters where changed since the only mods made where true dual exhaust and FIPK by K&N.
Thanks, Beth
I read the code from my 93 F150,4X4, 351 and it was 172 (lean). The truck has 112K miles and the O2 sensor has never been changed so I replaced it. After a few weeks the code came back.
I was going to check the fuel pressure over the weekend but only have the GM connector on my fuel gauge. Since it is relatively easy, I replaced the fuel filter since it had been awhile and I still have the 172 code. I had my fuel pump replaced about 2 years ago. Has anyone had this problem? Is the next step to test the fuel pressure?
The truck runs fine and gets about 15 miles/gal. The code only comes on after about 8 miles of driving and stays on until the truck is shut down. I never seem to get lucky just replacing parts and I'm up to my ears in wrenching on my Vette. Can anyone let me know what worked for them?
I have an aftermarket chip in the truck for whatever it's worth. I'm sure not many parameters where changed since the only mods made where true dual exhaust and FIPK by K&N.
Thanks, Beth
Elder User
Joined: May 2003
Posts: 500
Likes: 0
From: Wichita Falls
hmm my trucks running pretty rough right now, its gettin glean fuel as well. o2 sensor needs to be replaced, ill probably do that in the next week or so. guess you could say i have a similar problem but i don't have away to check codes after replacing the sensor. so im gonna have to use my 5 senses. 
not the best way to check and see if it fixed it completly.
not the best way to check and see if it fixed it completly.
