Intermittent CEL - 2002 A6q V6

[Jason]

Last year I attended a diesel emissions seminar put on by Pierburg.  They
brought up MAF cleaning.   They only recommend it as a temporary test.  Hot
wire MAFs become thin and damaged over time with particles coming in
contact with the wire.  Apparently cleaning them is only at best a short
term solution.  If it seems to fix your problem, the MAF will fail shortly
after anyways.

Jason




On Mon, Aug 19, 2013 at 9:39 PM, John Larson <viejoloco at comcast.net> wrote:

> On 8/19/2013 7:24 AM, Tony Hoffman wrote:
>
>> Time for a new MAF, IME. The hard downshift is the dead giveaway, as MAF
>> info goes to the TCU as well.
>>
>> Tony
>>
>> On Mon, Aug 19, 2013 at 9:15 AM, <ZZracing at aol.com> wrote:
>>
>>  .  Sometimes, the
>>> ESP light will clear, after which the car will throw a hard downshift
>>> when
>>> coming to a stop.  If I clear the codes, problem returns within 4 or 5
>>> miles.
>>> I have replaced fuel pump and fuel pressure valve, and a few vacuum lines
>>> which looked a bit dodgy, with no improvement.
>>> VAG Com shows:
>>> 16485 - Mass Air Flow Sensor (G70)
>>>               P0101 - 008 - Implausible Signal - MIL ON
>>> 16685 - Cylinder 1
>>>               P0301 - 008 - Misfire Detected
>>> 16688 - Cylinder 4
>>>               P0304 - 008 - Misfire Detected
>>> 16891 - Idle Control System RPM
>>>               P0507 - 001 - Higher than Expected. - Intermittent
>>> 16490 - Manifold / Barometric Pressure Sensor (G71) / (F96)
>>>               P0106 - 008 - Implausible Signal
>>> 17550 - Load Calculation Cross Check
>>>               P1142 - 002 - Lower Limit Exceeded - Intermittent
>>> Readiness: 0000 1100
>>>
>>> Any ideas?  Thanks in advance.
>>>
>>> Dave Zube
>>>
>> The smog guy next door to my now closed shop cleans 'em all the time, but
> I could never get cleaning to work very well, nor last very long.  There is
> a special MAF cleaner aerosol, don't use carb or brake cleaner.  Frankly,
> I'd just replace the MAF and be done with it.  If you know someone with a
> Worldpac account, maybe you can get a deal.  If not, maybe I can help you
> out.
>
> John
>
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