P0172 Code on Check Engine Light
Got a check engine light 3 weeks ago, but the truck was running fine so I cleared it by disconnecting the ground and it went away.
Last week it came back - I cleared it again. I had planned to take the truck to the dealer anyway for a 4WD service & Tune up, so I took it in.
I told them about the light and to do the service, they called back saying they recommended a 3M thottle body cleaning ($160), a new PVC valve ($60) and a new fuel filter ($160) I said "bite me" and thta was that.
About 5 days later, the check engine light came back on. I went to autozone and got the code, a fuel filter, a PVC and a can of thottle body cleaner ($20) The code was P0172 - Bank one rich reading
I replaced the fuel filter (thanks to this site for great directions), replaced the PVC and cleaned the throttle body. The throttle body was extremely clean for 52,000 miles, I frequenty add Injector cleaner and use premium gas (but not always) Reset the CEL.
I'm guessing there may be 1 of three problems -
Clogged injector (clogged open) and dumping fuel
Bad O2 Sensor
What do you guys think and suggest as a plan of action?
Last edited by Rookie; 05-07-2005 at 07:01 PM.