- Feb 11, 2023
- Reaction score
Oxygen sensors are only good for around 100K. My Tahoe LTZ 5.3L was having lack of power getting on the highway like starving for fuel so I installed 2 new pre cat sensors and the engine came back alive and BTW it had no codes just lazy sensors. Your fuel smell from the exhaust could be a bad purge valve sucking fuel threw the canister plus you can try cleaning the injectors and if all else fails do a exhaust back pressure test to see if the cats are plugged. Of Coarse the normal things like plugs fuel pressure MAF sensor for dirt and intake gaskets etc.....