Intermittent CEL - 2002 A6q V6

[Cody Forbes]

Also a possibility. You can try MAF cleaner from the auto parts store, but that's hit or miss. Check the sensor from my previous message first since that's free, then try a new MAF. You can data log the MAF signal to look for anomalies too.

-Cody Forbes (mobile)

On Aug 19, 2013, at 10:24 AM, Tony Hoffman <auditony at gmail.com> 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
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