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Audi A6 2.5 TDI, Preheat lamp flashing (AAT)

 
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Post09-10-2009, 19:56    Subject: Audi A6 2.5 TDI, Preheat lamp flashing (AAT) Quote

Hello,

I am Daniel, and unfortunately, I have a problem with my Audi. First, let's get the background information:

I recently acquired the Audi, with only 335,000 km on the odometer, from a reputable street dealer (you won't find cars like this at other export dealerships). And that's when the problems started. The car was a bargain so far, the only thing was that it idled loudly, I used the search function on this forum and found helpful information.
I cleaned and partially re-sealed the VP37 after getting a tip from this forum, and the sawing noise is gone. However, the indicator light has been blinking since then??

Initially, I monitored the settings using VAG-Com.

Fault memory displays the following message:

Code:
Part number: 4A0 907 401 F
Part and/or Version: 2.5l R5/2VT EDC AT D22
Encoding: 00000
Workshop Code: WSC 00000
1 Error found:
00765 - Actuator for Valve Actuation Path (G149)
27-10 - Unlikely Signal - Sporadically

Also, I also made a LOG:

Friday, 09, October, 2009, 18:23:06
4A0 907 401 F ,,2.5l R5/2VT EDC AT D22,

,Group A:,'000,,,,,,,,,,Group B:,, Not Running,Group C:,, Not Running
,,,,,,,,,,,,,,,,,,,,,
,TIME,,,,,,,,,,,TIME,,,,,TIME,,,,
MARKER,STAMP,,,,,,,,,,,STAMP,,,,,STAMP,,,,
,0.00,034,057,000,013,087,235,084,167,143,121,,,,,,,,,,
,0.38,033,056,000,016,087,235,084,167,143,120,,,,,,,,,,
,0.78,034,055,000,013,086,235,084,167,143,121,,,,,,,,,,
,1.22,033,057,000,015,087,235,084,167,143,120,,,,,,,,,,
,1.66,034,056,000,014,086,235,084,167,143,121,,,,,,,,,,
,2.11,033,053,000,015,087,235,084,167,143,119,,,,,,,,,,
,2.58,033,058,000,015,087,235,084,167,143,119,,,,,,,,,,
,3.04,034,055,000,013,087,235,084,167,143,122,,,,,,,,,,
,3.50,033,054,000,015,087,235,083,167,143,121,,,,,,,,,,
,3.95,034,055,000,013,086,235,083,167,143,121,,,,,,,,,,
,4.42,033,055,000,015,087,235,084,167,143,119,,,,,,,,,,
,4.86,034,056,000,013,087,235,083,167,143,121,,,,,,,,,,
,5.29,033,055,000,016,087,235,084,167,143,122,,,,,,,,,,
,5.68,035,055,000,011,087,235,083,167,143,121,,,,,,,,,,
,6.08,032,057,000,017,087,235,083,167,143,121,,,,,,,,,,
,6.49,035,055,000,010,086,235,083,167,143,123,,,,,,,,,,
,6.94,033,057,000,015,087,235,083,167,143,119,,,,,,,,,,
,7.39,033,055,000,014,087,235,083,167,143,119,,,,,,,,,,
,7.84,033,057,000,014,087,235,083,167,143,120,,,,,,,,,,
,8.30,033,058,000,015,087,235,083,167,143,120,,,,,,,,,,
,8.77,034,058,000,012,087,235,083,167,143,123,,,,,,,,,,
1.  23.033.059,000.015.087.235.083.167.143.120,,,,,,,,,,
,9.71,033,055,000,014,087,235,083,167,143,122,,,,,,,,
,10.17,033,059,000,015,087,235,083,167,143,119,,,,,,,,,,
,10.62,033,056,000,014,087,235,083,167,143,120,,,,,,,,,,
,11.05,034,058,000,014,086,235,083,167,143,123,,,,,,,,,,
,11.50,033,057,000,014,087,235,083,167,143,124,,,,,,,,,,
,11.90,033,058,000,016,087,235,083,167,143,117,,,,,,,,,,
,12.30,035,059,000,012,087,235,083,167,143,124,,,,,,,,,,


Based on the values I can assess, they seem to be within the acceptable range, except possibly for the injection start timing, which is quite high, but still within the specified limits.

If I then increase the injection amount, or the value, the light no longer flashes, however, I experience a noticeable loss of power and extremely high fuel consumption (7.5 to 11.5), furthermore, the engine starts poorly and also responds poorly to acceleration.

I hope I haven't forgotten anything and that the text above will help with the diagnosis.

Thank you in advance.
Gruß Daniel
_______________________________________

Audi A6 (C4) Avant 2,5 TDI Autom. Bj. 1995
S/4A5/Audi100/A6 Avant/AAT/CDS
Klilometerstand: 335137km (Stand 9.10.2009)


Translated on 03-07-2026, 15:19.
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