Need help...B0171 Lean bank 1
Thread Starter
Instructor
Joined: Sep 2007
Posts: 163
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From: Ca
Need help...B0171 Lean bank 1
This is the second time I've gotten this code, the first time was @ 7k miles or so and completely stock, I took it to the dealer and they really couldn't figure it out just did a software update and said it's still running a bit lean but could be because the car hadn't been driven much and just told me to use chevron w techron and to put some miles on it now 5k later same issue... Any ideas??? 
Thread Starter
Instructor
Joined: Sep 2007
Posts: 163
Likes: 0
From: Ca
Ok I'll give that a shot, now I was told that it takes the car having the same issue occur multiple times before it throws a code ie(it took 5k to reoccur) is it safe to be driving it around like that? I had a similar issue in my c5z running lean on bank 1 and the motor ended up grenading on me?
Le Mans Master
Joined: Aug 2004
Posts: 5,259
Likes: 16
From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
I think it sets a code after the second consecutive failure. Does it idle roughly? If you have a scan tool you should be able to run down a check list which includes the items already suggested.
There can also be a small vaccum leak, weak injector or oxygen sensor electrical connector shorting out against the exhaust.
Your profile lists a cam & tune. A lean condition in a car with a cam & tune can be very dangerous so I would take car of it as soon as possible.
good luck
There can also be a small vaccum leak, weak injector or oxygen sensor electrical connector shorting out against the exhaust.
Your profile lists a cam & tune. A lean condition in a car with a cam & tune can be very dangerous so I would take car of it as soon as possible.
good luck
Thread Starter
Instructor
Joined: Sep 2007
Posts: 163
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From: Ca
My C5z has the cam n tune but the C6 is pretty much stock just a CAI and it originally threw the code bone stock and now again w the CAI. It doesn't idle roughly but occasionally it will surge drops down to 500 and then back to normal...
Le Mans Master
Joined: Aug 2004
Posts: 5,259
Likes: 16
From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
My mistake.... check a previously outlined. It could also be a small blockage (debris in front of the MAf or a loose connector)
good luck
Drifting
Joined: May 2002
Posts: 1,479
Likes: 42
From: Dallas / Ft. Worth The Republic of TEXAS
Get someone to scan the car and check the LTFT on Bank 1. It will be obvious if there is a problem on 1 side only. If there is it cannot be anything related to the MAF. As stated already switch front 02's and then check for vacuum leaks. These are by far the most likely culprits 
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Burning Brakes
Joined: Jul 2008
Posts: 923
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From: Green Bay Wisconsin
Get someone to scan the car and check the LTFT on Bank 1. It will be obvious if there is a problem on 1 side only. If there is it cannot be anything related to the MAF. As stated already switch front 02's and then check for vacuum leaks. These are by far the most likely culprits
Douglas in Green Bay
Drifting
Joined: May 2002
Posts: 1,479
Likes: 42
From: Dallas / Ft. Worth The Republic of TEXAS
The MAF cannot cause only 1 bank to be off anymore than just a little bit from side to side. Hope this helps
Safety Car
Joined: Sep 2008
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From: Location: Location: kAnSaS
do this first, usually the sensors go lean when they are going bad. Remember it doesnt read fuel at all it reads oxygen so a vacuum leak or hose off can cause issues as well.
Thread Starter
Instructor
Joined: Sep 2007
Posts: 163
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From: Ca
So I got the car back from the dealer yesterday and it turns out the #5 injector was bad... Wouldn't have expected that after only 13K but S**t happens, just glad to have her back on the road now time for some new tires !
