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What do you guys reccommend for fixing this code ive tried cleaning the maf sensor, should i replace the froont oxygen sensor which is the upstream?

What's the code's English name again? If it's Bank 1 Lean, that's your front O2 sensor taking a dump. Replace with a Delco and call it good.

Thank You again lesabre in buffalo

Just to make sure this is right by were the cylinder 6 spark plug is right?

yep, right on top of the downpipe, precat

Trick to getting it out: Spray PB Blaster or another penetrant onto the sensor bung in the manifold while it's still warm 10-15 minutes after shutting a warmed-up engine down, or after running a cold engine for 2-3 minutes. The heat helps the oil wick into the threads, making the sensor easier to get out. Using this trick I was done with my O2 sensor in 45 minutes, including renting/returning the O2 sensor socket to the parts store.

this is code is also commonly caused by vacuum leaks, I would check for that first. p0171 is one of those codes that can be thrown by many things

Did a carb spray on the vacuum lines and found a crack from the throttle body and leads to the regulator its two lines that combine into one..would provide a pic but on this site not sure how too

On the O2 sensor, I just stuck an O2 sensor socket on it, used a long extension and had a breaker bar to work it and got it off. No PB Blaster, no warmup

Bonnefied_GM wrote:On the O2 sensor, I just stuck an O2 sensor socket on it, used a long extension and had a breaker bar to work it and got it off. No PB Blaster, no warmup

you got lucky if you ask me

98buicklesabre wrote:Did a carb spray on the vacuum lines and found a crack from the throttle body and leads to the regulator its two lines that combine into one..would provide a pic but on this site not sure how too

that "might" be your culprit right there

wake wrote:you got lucky if you ask me

Well, it took some muscle to start budging it bit by bit, and then it started to loosen up pretty nicely. I tried PB Blaster once on a fuel filter and it did nothing. In fact, even several applications over a day or two and LOTS of wrenching and muscling that literally slid me along the floor (this was on a previous car, mind you), I only was warping the actual bolt on the fuel line (it literally started looking like it was becoming flat). Considering the rust on the fuel filter and threaded fitting end, I'd assume it was pretty well rust-welded together......I never got the fuel filter changed

This were i found my crack when using the Carb Cleaner the idle def changes now i just need to figure out how to change this and hopefully get this p0171 code cleared. Its two lines going to the throttle going to the fuel pressure regulator and the other one i honestly dont know where it goes