[A4] RE: Mixture Too Lean P0171 Error

Rocky Mullin caliban at sharon.net
Thu Mar 10 22:27:59 EST 2005

	what a terrible story.  i have an APR chip in my car, in fact i
bought one with a spare ECU.  i switch the car from one ECU to the other
now and then, sometimes just for service so i don't go in their system
as having been chipped (still under warranty).  haven't had any trouble
at all.

At 10:07 PM -0500 3/10/05, Yee, Phil wrote:
>Update: shortly after writing the following thread, the error started to
>cause a problem where I could not get beyond 5psi of boost.  Bad BPV?  More
>vacuum leaks?  Check and swap and check and swap and check and nothing.  I
>finally decided to pull out the APR chip.  Solder back the stock chip.  I
>was a little nervous, but everything worked fine.
>No more 5psi limit (back to approx 8psi/170hp), no error P0171, no 5k rpm
>pinging, no signs of lean nor pinging whatsoever, smooth as butter (just a
>little smaller stick of butter than before).  That chip was the source of so
>much headache.  Before I de-chipped my car, I called the local APR dealer
>for some support.  "Surprisingly" they no longer carried APR due to APR's
>poor product delivery, product support, and mounting complaints.  Months
>before when I called APR directly, they were all like "we test it, and there
>should be no pinging.  have a nice drive."  IMO, it was amazing at the
>beginging, but that APR chip ended up as crap.  Next time, maybe I'll get a
>Giac, or an S4.
>>-----Original Message-----
>>From: Yee, Phil
>>Sent: Monday, March 07, 2005 12:52 PM
>>To: 'a4 at audifans.com'
>>Subject: Mixture Too Lean P0171 Error
>>I've been getting the P0171 code a few times a week for about a month now,
>along with a some >amount of pinging.  I've checked my fuel pump power
>(fuses, relay), injector piezo
>>resistance measurement (per Bentley manual), vacuum leaks, and I still get
>the message here >and there.  I did find a frayed and cracked vacuum hose
>that goes from the intake manifold
>>to the BPV line, replaced it, and it really improved things (which
>eliminated almost all of >the pinging).  I'm running an APR chip with a
>1-cooler range NGK plugs.  The fuel filter is >only a few thousand miles
>old.  The plugs are also a few thousand miles old, don't look bad, >if a
>tiny bit on the hot side.
>>It drives very well 99% of the time.  I get the error when I'm barely have
>my foot on the
>>gas at about 1700-2500 rpm (very light load).  The only time I notice a
>truly apparent
>>problem is when it pings sometimes under very high load in the 5000+ rpm
>>Does anyone have any insights, or suggestions on what to check next?  (I
>don't have a vag
>>com, btw.)
>>00' 1.8TQ
>>01' 1.8TAvant
>A4 mailing list
>A4 at audifans.com

  Rocky Mullin 


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