I have a 2006 Trailblazer which is pissing me off. I had the throttle body cleaned a week ago (it had been throwing a code and the CEL). Well now the damn CEL is on again. Autozone said "P0171" was the code and suggested running cleaner thru the tank. I did that...light went off...came back on...off...now on again. I am getting sick of messing with this damn car it needs to get inspected and cant w/ the CEL on. Any idea what will fix this code or recommendations on a reasonable mechanic?

1/18/2011 10:22:03 AM

http://www.obd-codes.com/p0171

Check for a vacuum leak and try cleaning the MAF sensor. Running a cleaner in the fuel won't do that. Someone else probably has better suggestions.

1/18/2011 10:27:18 AM

Could be that the MAF is fouled somewhat. I would also check fuel pressure (under load if possible), see if that's a little low. Have you ever replaced the fuel filter?

And yeah, it could be a vacuum leak too. P0171 is lean A/F on Bank 1 (and if you have the Atlas six, you only have one bank, lol). This is just gonna take some sensible troubleshooting.

1/18/2011 11:10:06 AM

No I have not replaced the fuel filter. I guess I need to find a mechanic.

1/18/2011 12:29:15 PM

Where are you located? Jeepman and I do a lot of work.

1/18/2011 12:40:36 PM

Clayton (40/42) area

1/18/2011 1:49:16 PM

Byrd's Auto Service
2323 East Garner Road, Raleigh, NC 27610-9665

(919) 779-2689


This guy is pretty close to you...my whole family has taken all of our vehicles to him for years...knows his stuff and is very honest

[Edited on January 18, 2011 at 7:10 PM. Reason : .]

1/18/2011 7:07:50 PM

The proper way to clean that tb would have been to spray tb cleaner on a rag and wipe the unit out. Is it a drive by wire unit? If so, then the unit will need to be replaced.

1/19/2011 6:22:05 PM