1999 Audi A6 2.8L - 17746 16684-7 doesn't make sense

[dhoerl]

I was driving at a highway speed pulled into a gas station, and my car all of a sudden started running poorly and the check engine light came on, then blinked! Had never seen it blink!

I looked up all the codes - 17746 says its the G40 sensor, and the Bentley's manual shows that on the driver's side back of the engine head.

But but but - those cylinders are marked 4,5, and 6. The other error codes are shown as cylinder 1,2 and 3.

The car runs but really strugges at idle. The left side of the engine (passenger side) seems to be making more mechanical noise than the right (drivers) side.

I'm going to get new cam sensors (if one died after 20 years the other is probably not going to last much longer either). But - why doesn't the info from vag-com correlate???

EDIT: Drove the car around while monitoring Engine Group 15 - Cylinder 1-3 misfires. When I go from idle to 15 MPH the numbers of all 3 shoot into the hundreds.

[PetrolDave]

It might be helpful if you could post the Auto-Scan.

[dhoerl]

Monday,01,July,2019,14:34:30:11064
VCDS -- Windows Based VAG/VAS Emulator Running on Windows XP x86
VCDS Version: 17.1.3.0
Data version: 20170320 DS267.7
www.Ross-Tech.com


Mileage: 286290km-177892mi   Repair Order: 



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005)
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
          75 76 77
 
   Mileage: 286290km-177892miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 078-907-551-AHA.lbl
   Part No: 4D0 907 551 AH
   Component: 2.8L V6/5V  MOTR AT D03  
   Coding: 06252
   Shop #: WSC 02325  
   VCID: 6CDDD5231CA0CF2125-4A08

9 Faults Found:
17746 - Camshaft Position Sensor (G40) 
            P1338 - 35-00 - Open or Short to Plus
16684 - Random/Multiple Cylinder Misfire Detected 
            P0300 - 35-10 -  - Intermittent
16685 - Cylinder 1 
            P0301 - 35-10 - Misfire Detected - Intermittent
16687 - Cylinder 3 
            P0303 - 35-10 - Misfire Detected - Intermittent
16686 - Cylinder 2 
            P0302 - 35-10 - Misfire Detected - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected 
            P0300 - 35-00 - 
16685 - Cylinder 1 
            P0301 - 35-00 - Misfire Detected
16687 - Cylinder 3 
            P0303 - 35-00 - Misfire Detected
16686 - Cylinder 2 
            P0302 - 35-00 - Misfire Detected
Readiness: 0010 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 01V-927-156.lbl
   Part No: 4B0 927 156 G
   Component: AG5 01V 2.8l5V  USA 8509  
   Coding: 00000
   Shop #: WSC 00000  
   VCID: 2B5F163FD92E08196C-4A08

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8E0-614-111-EDS.lbl
   Part No: 8E0 614 111 A
   Component: ABS/EDS 5.3 QUATTRO D00  
   Shop #: BB 24334  
   VCID: 1C3DC5E38C80FFA115-5038

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4B0-959-655-AI8.lbl
   Part No: 4B0 959 655 H
   Component: Airbag Front+Seite 0002  
   Coding: 00106
   Shop #: WSC 02324  
   VCID: 356B30470F6A4EE90A-50C8

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4B0-919-xxx-17.lbl
   Part No: 4B0 919 930 RX
   Component: C5-KOMBIINSTR. VDO D18   
   Coding: 07262
   Shop #: WSC 08087  
   VCID: 0F27A2AF4D76543960-5038

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels: 4B0-962-258.lbl
   Part No: 4B0 962 258 J
   Component: Central Lock/Alarm  D32  
   Coding: 15885
   Shop #: WSC 02325  
   VCID: 30650153F0086BC159-4E0C

7 Faults Found:
01371 - Alarm triggered by Door Contact Switch; Driver's Side 
            35-00 -  - 
01572 - Alarm triggered by Door Contact Switch; Passenger Side 
            35-00 -  - 
01370 - Alarm triggered by Interior Monitoring 
            35-00 -  - 
00955 - Key 1 
            09-10 - Adaptation Limit Surpassed - Intermittent
00956 - Key 2 
            09-10 - Adaptation Limit Surpassed - Intermittent
01574 - Alarm triggered by Door Contact Switch; Rear Right 
            35-00 -  - 
01573 - Alarm triggered by Door Contact Switch; Rear Left 
            35-00 -  - 

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: None
   Part No: 4B0 959 760 A
   Component: Sitzmemory          D05  
   VCID: 2B5F163FD92E08196C-4A08

No fault code found.

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 4B0-951-173.lbl
   Part No: 4B0 951 173 
   Component: Innenraumueberw.    D03  
   Coding: 00001
   Shop #: WSC 02325  
   VCID: 60C5B113E0689B4189-4A52

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8D0-035-1xx-56.lbl
   Part No: 4B0 035 186 A
   Component:  Radio              D02  
   Coding: 00205
   Shop #: WSC 02325  
   VCID: 1E39CFEB9A9CEDB1FB-4A20

No fault code found.

End-------------------------(Elapsed Time: 06:21)--------------------------

[dhoerl]

Done! See additional info posted.

[Uwe]

G40 is normally the cam position sensor for bank 1, which I would think is the bank that has cylinders 1, 2, and 3.

On two-bank engines like your V6, there may be a second cam position sensor for bank 2 as well. If so, it would usually be designated as G163.

-Uwe-

[Jack@European_Parts]

Diagnostic stack maybe incorrectly assigned but I think is correct & stack is within controller & as a possible error from the OEM, this would not be VCDS because VCDS only reports what ECU displays.


Probably time to take VC off and investigate the shoes on the cam tensioner adjusters, dont run engine further until inspected if you hear a noise & for fear of damaging a valve.

[dhoerl]

Thanks - will do!

[dhoerl]

Jacke does it again! I replaced the can sensor, same codes when running. Then pulled the cover and lo and behold:

[NZDubNurd]

You could have gotten a few more miles out of that!

Haha! Good save Jack! That was going to become a MUCH bigger problem, very soon!

[Jack@European_Parts]

I first tried here but the diagnostic spirits were unrepresentative.....dam new diagnostic board scanner enhanced doesn't work.




Than I just thought, well this has happened before, so what is the likelihood of it being shear repetition statistically?



Good thing the MIL came on huh?