Error 00000 - Glowplug light turns on and limp mode

   #1  

avisonjohn

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Audi A4 B7 Cabriolet 2008

Glow plug light flashes and ESP light comes on instrument panel, and car goes into limp mode. Turning car off and on can clear it, but sometimes comes back on.

Does anybody have any ideas? There are fault codes only showing on Engine screen - I've attached a dump below

Code:
Sunday,31,May,2020,14:00:56:43836
VCDS Version: Release 20.4.1 (x64) Running on Windows 10 x64
www.Ross-Tech.com
                Address 01: Engine       Labels: 03G-906-016-BPW.clb
Control Module Part Number: 03G 906 016 LQ    HW: 03G 906 016 KP
  Component and/or Version: R4 2,0L EDC  000CG  1717
           Software Coding: 0000076
            Work Shop Code: WSC 66565 257 00032
                      VCID: 7DA7FCDBC1FBDD2338D-8028
2 Faults Found:
008194 - Particulate Trap Bank 1 
               P2002 - 000 - Efficiency Below Threshold - Intermittent
             Freeze Frame:
                    Fault Status: 00110000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 140863 km
                    Time Indication: 0
             Freeze Frame:
                    RPM: 2142 /min
                    Speed: 69.0 km/h
                    (no units): -5.10
                    (no units): -10.20
                    Mass Flow: 93.87 g/s
                    Temperature: 396.0°C
                    Temperature: 18.9°C
000000 - SAE - Reserved by Document ISO 15031-6 
               P0000 - 000 - 2005 - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 1
                    Fault Frequency: 2
                    Reset counter: 255
                    Mileage: 140892 km
                    Time Indication: 0
             Freeze Frame:
                    RPM: 1470 /min
                    Speed: 11.0 km/h
                    Load: 16.5 %
                    Voltage: 14.29 V
                    Bin. Bits: 00000000
                    Voltage: 1.520 V
                    Voltage: 0.380 V

Readiness: 0 0 1 0 0
 
   #2  

Uwe

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What are the odds that this ECU's software is modified with a "remap"? It really shouldn't throw a fault code with all zeros.

Please post a complete Auto-Scan for better context, especially since the ESP light comes on.

-Uwe-
 
   #3  

avisonjohn

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Bought the car a week ago from a used dealer, so wouldn't know if its had the ECU remapped previously.
It doesn't look to have had any mods or upgrades and looks like it's been left pretty standard. Not sure how to test if it's had a remap previously.
I reset the fault code earlier but will post up a full dump in just a few moments for you.
Thank you
 
   #4  

avisonjohn

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OK here is a full AutoScan for you as requested.
If it helps, I went for a drive earlier and the light came on again and went into limp mode.
I pulled over and cleared the fault, restarted the car and all looked OK, then hit the ESP button on the dash to turn the light on inside the instrument panel, and drover around 20 miles of motorway and the car performed fine.
Not sure if that is of any help or not.

Code:
Sunday,31,May,2020,18:51:33:43836
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 20.4.1.0 (x64)  HEX-V2 CB: 0.4508.4
Data version: 20200331 DS317.0
www.Ross-Tech.com


VIN: WAUZZZ8H88K013250   License Plate: 


Chassis Type: 8H (8H - Audi Cabrio B6/B7 (2003 > 2009))
Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 26 36 37 45 46 55 56 57
          63 65 67 73 75 76 77
 
VIN: WAUZZZ8H88K013250   Mileage: 140950km-87582miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 03G-906-016-BPW.clb
   Part No SW: 03G 906 016 LQ    HW: 03G 906 016 KP
   Component: R4 2,0L EDC  000CG  1717  
   Revision: --H06---    Serial number:               
   Coding: 0000076
   Shop #: WSC 66565 257 00032
   VCID: 7DA7FCDBC1FBDD2338D-8028

No fault code found.
Readiness: 0 0 1 0 0 

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 01J-927-156.lbl
   Part No SW: 8E5 910 155 J    HW: 01J 927 156 HT
   Component: V30 01J 2.0l PD RdW 0040  
   Revision: 00000012    Serial number: 00000002103869
   Coding: 0000001
   Shop #: WSC 04940 001 00001
   VCID: 313F10EB4D23E943EC5-8064

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8E0-910-517.clb
   Part No SW: 8E0 910 517 H    HW: 8E0 614 517 BF
   Component: ESP8 FRONT      H06 0140  
   Revision: 00000000    Serial number: 00000000000000
   Coding: 0004402
   Shop #: WSC 63252 001 1048576
   VCID: 2C01019F6A0184ABDF3-8078

1 Fault Found:
01314 - Engine Control Module 
            013 - Check DTC Memory - Intermittent
             Freeze Frame:
                    Fault Status: 00101101
                    Fault Priority: 2
                    Fault Frequency: 4
                    Reset counter: 38
                    Time Indication: 0

             Freeze Frame:
                    Hex Value: 0x0200
                    Hex Value: 0x4A02
                    Hex Value: 0x0027
                    Hex Value: 0x01AB
                    Hex Value: 0x0000


-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8E0-820-043.lbl
   Part No: 8E0 820 043 BL
   Component:   A4 Klimaautomat   3233  
   Coding: 00100
   Shop #: WSC 00672  
   VCID: 6C81C19FAF9144AB9F3-50F4

5 Faults Found:
00710 - Defroster Flap Positioning Motor (V107) 
            41-10 - Blocked or No Voltage - Intermittent
00601 - Potentiometer On Positioning Motor for Central Flap (G112) 
            30-00 - Open or Short to Plus
00601 - Potentiometer On Positioning Motor for Central Flap (G112) 
            09-00 - Adaptation Limit Surpassed
00735 - Potentiometer in Positioning Motor for Air recirculation Flap (G143) 
            09-00 - Adaptation Limit Surpassed
00819 - High Pressure Sensor (G65) 
            07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 8E0-907-279-8EC.lbl
   Part No: 8E0 907 279 N
   Component: int. Lastmodul  ECE 0907  
   Coding: 20001
   Shop #: WSC 00672  
   VCID: 3D273CDB846B1D2378D-4AA4

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8H0-959-655-94.lbl
   Part No SW: 8H0 959 655 G    HW: 8H0 959 655 G
   Component:    Airbag 9.42  H01 1840  
   Revision: 92H01184    Serial number: 003CZ0008MD7  
   Coding: 0071114
   Shop #: WSC 63252 001 1048576
   VCID: 3E253BD78C7D063B617-806A

   Subsystem 1 - Serial number: 6332BRB403876EFB2

   Subsystem 2 - Serial number: 6342BRB4038D8403L

   Subsystem 3 - Serial number: 63729RB4037B0B95T

   Subsystem 4 - Serial number: 63829RB4037B015EP

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 8E0-953-549.lbl
   Part No: 8E0 953 549 Q
   Component: Lenksáulenmodul     0801  
   Coding: 03111
   Shop #: WSC 00672  
   VCID: 41DF402BF89379C31C5-4AA4

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8E0-920-9xx-8EC.lbl
   Part No SW: 8H0 920 951 D    HW: 8H0 920 951 D
   Component: KOMBI+WFS 4     H14 0200  
   Revision: 0200        Serial number: 00000000000000
   Coding: 0006411
   Shop #: WSC 56029 002 1048576
   VCID: 2E050B975C0DF6BBF17-50F4

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 8E0-920-9xx-8EC.lbl
   Part No SW: 8H0 920 951 D    HW: 8H0 920 951 D
   Component: KOMBI+WFS 4     H14 0200  
   Revision: 0200        Serial number: 00000000000000
   Coding: 0006411
   Shop #: WSC 56029 002 1048576
   VCID: 2E050B975C0DF6BBF17-50F4

No fault code found.

-------------------------------------------------------------------------------
Address 26: Auto Roof        Labels: 8H0-959-255.lbl
   Part No: 8H0 959 255 A
   Component:  VSG  B6 CABRIO     7094  
   Shop #: WSC 00672 785 00200
   VCID: 343119FFB221DC6B873-50F4

No fault code found.

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 8E0-951-177.lbl
   Part No: 8H0 951 178 
   Component: Innenraumueberw.   0411  
   Coding: 00001
   Shop #: WSC 00000  
   VCID: 6FBBD6939E87BFB3BA1-50AE

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 8E0-959-433-MAX.clb
   Part No: 8H0 959 433 M
   Component: Komfortgerát T3B    5442  
   Coding: 06911
   Shop #: WSC 00672  
   VCID: 3E253BD7896D063B617-4AA4

   Subsystem 1 - Part No: 8H2959802D
   Component: Tõrsteuer.FS BRM 0205  

   Subsystem 2 - Part No: 8H2959801D
   Component: Tõrsteuer.BF BRM 0205  

   Subsystem 3 - Part No: 8H0959801A
   Component: Tõrsteuer.HL BRM 0003  

   Subsystem 4 - Part No: 8H0959802A
   Component: Tõrsteuer.HR BRM 0003  

2 Faults Found:
01616 - Signal Wire to Interior Monitor 
            79-10 - Please Check Fault Codes - Intermittent
01616 - Signal Wire to Interior Monitor 
            49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8J0-035-1xx-56.clb
   Part No SW: 8E0 035 186 AL    HW: 8E0 035 186 AL
   Component: R Concert2+     H02 0270  
   Revision: 00H02000    Serial number: AUZ1Z3H8971904
   Coding: 0610331
   Shop #: WSC 00672 785 00200
   VCID: 71BFD0EB8D83A943AC5-5160

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 8P0-862-335.lbl
   Part No SW: 8P0 862 335 Q    HW: 8P0 862 335 Q
   Component: FSE_255x BT     H26 0350  
   Revision: 00000000    Serial number: 00000005556949
   Coding: 0001602
   Shop #: WSC 00672 785 00200
   VCID: 44D1493FE2816CEB373-50D0

No fault code found.

End----------(Elapsed Time: 05:44, VBatt start/end: 12.3V/12.2V)-----------
 
   #5  

avisonjohn

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A quick update

Turning the ESP button on had no effect as fault came back again.

I don't have access to a jack, but from what I can see, it looks as if this car (2.0TDI 140BHP) doesn't actually have a DPF installed, just a Cat

So why would I get an error about the particulate??
 
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   #7  

avisonjohn

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Not as far as I'm aware, but after speaking to a reputable tuner who guided me through over the phone on how to locate the DPF (which wasnt there), he said (after I mentioned Uwe's comment) that it is simply possible somebody has put a map on the ECU for an incorrect car and it is looking for a DPF.
Would that make sense regarding the P0000 code though?
He is located literally the opposite end of the country but is coming toward this area in a few weeks.
Until then, if I took this to the main dealer, would they be able to:

A. Confirm it's been tampered
B. Restore/fix it

If yes to both, how much would we be looking in costs approximately?
 
   #8  

Uwe

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AFAIK a 2008 A4 B7 won't have a DPF as DPF were introduced in 2009.
Didn't Audi offer a DPF retrofit on some earlier cars? I have a fuzzy recollection about this..

-Uwe-
 
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PetrolDave

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Didn't Audi offer a DPF retrofit on some earlier cars? I have a fuzzy recollection about this..
I've only ever owned one Audi diesel (a 2004 B6 A4 1.9Tdi Sport Avant) which I sold in 2005 and didn't have a DPF - so I'll have to leave that for someone else to answer :popcorn:
 
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   #11  

avisonjohn

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OK, so a big thank you to everybody so far - thought I'd come back and post an update on what's been happening.

So, I took the vehicle to a very well recommended place - a garage with a mechanic that tries to actually fix problems instead of just replacing parts!

So everybody was correct - the car's ECU *had* been mucked about with - VCDS showed successful programming attempts as '3'.
Took it to the garage (they also specialise in VAG remaps) and they restored the software on the ECU to factory standard from an original software rip which they have to hand.

They took it for a road test, and instantly the same issue occured with loss of power, only this time, instead of code '00000', they got 'P0226'. Bloody throttle pedal!

The annoying thing is, I have already replaced the accelerator to try and rule that out as the culprit.
So, Ross Tech WiKi to the rescue, as per.

The WiKi has an entry for '16610-P0226', however, I was getting '00550-P0226' (Throttle Pedal Position Sensor (G79): Implausible Signal - Intermittent)

Would this WiKi entry still apply to me?

And if so, the entry mentions the O2 Sensor. I had a look on Erwin yesterday but kept getting Internal Server Error 500 and the pages failed to load so that was a waste of subscription money.
Looking on AutoData, it shows just a single O2 Sensor on what looks to be the DPF - is this correct and are there any more?

I'll get another full scan up shortly, but as a reminded its the 2008 Audi A4 B7 Cabriolet (8EH) 2.0TDI PD BPW - original dump ison the first page.
Any advice people can offer me now would be a huge help.

As for the DPF issue, mechanic is convinced that this Throttle Pedal Position Sensor problem is a separate issue to the DPF issue earlier, but can't get me booked in for several weeks to investigate as they are fully booked (took several weeks just to get this appointment and he was done in an 1.5 hours!).
 
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   #12  

Uwe

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Took it to the garage (they also specialise in VAG remaps) and they restored the software on the ECU to factory standard from an original software rip which they have to hand.

They took it for a road test, and instantly the same issue occured with loss of power, only this time, instead of code '00000', they got 'P0226'. Bloody throttle pedal!
FOD strikes again! :)

The WiKi has an entry for '16610-P0226', however, I was getting '00550-P0226' (Throttle Pedal Position Sensor (G79): Implausible Signal - Intermittent)
Yes, it applies. In most ECUs, the accelerator pedal and the oxygen sensor come into the same Analog-to-Digital converter chip, so an a wildly out-of-range signal from the oxygen sensor can cause quite the disturbance in the force.

-Uwe-
 
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avisonjohn

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Thanks for the clarification!

I'm just looking to source an 'el cheapo' o2 sensor now (presuming I need both the upstream and downstream changed?) so that I can fit it to see if it makes a difference.
I've almost worked out how to reproduce the problem, but it's not an exact science.

So I'll pop the cheapo sensor in, and if it makes any difference or is more difficult to reproduce, I'll go ahead and get them swapped out for some decent ones.
Don't fancy paying £100+ for each sensor with no idea if it's going to make any difference just yet.
 
   #14  

Uwe

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I'm just looking to source an 'el cheapo' o2 sensor now (presuming I need both the upstream and downstream changed?) so that I can fit it to see if it makes a difference.
Many people have had less than wonderful results with "El Cheapo" oxygen sensors. So if you go that route, don't be surprised if it just adds to the list of issues. If it were mine, I'd start with a thorough visual inspection of the oxygen sensor wiring.

-Uwe-
 
   #15  

avisonjohn

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Many people have had less than wonderful results with "El Cheapo" oxygen sensors. So if you go that route, don't be surprised if it just adds to the list of issues. If it were mine, I'd start with a thorough visual inspection of the oxygen sensor wiring.

-Uwe-
I know several people who have had lots of issues with the cheap ones failing before too long, so I'm kind of expecting that.
I was going to give it a visual check, but having to remove the cover and airbox to get to it, and then soak in penetrating fluid and struggling to undo the bugger with not much room, just to inspect it, I thought I'd order a replacement first. If it sorts the issue for now, I'll approach Audi for a genuine part.

Can't seem to see the wiring and plug at the moment though,so will have to check that when I remove everything else to get to it

EDIT:
What I presumed would be the 6 pin plug for the O2 sensor, located just under the expansion tank,appears to be a temperature sensor as VCDS instantly threw up a fault as soon as I unplugged that and caused the coil light to start flashing until I reconnected it. Could'nt see any other 6 pin plugs around that area, so maybe it's not a 6 pin plug after all.
AutoData doesnt show the wiring for it, and Erwin keeps giving me problems so can't check on there.
 
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avisonjohn

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OK, the wiring for the oxygen sensor looks ok from a visual inspection, but I did notice something a little odd.

On VCDS, MVB 40.4 Ithink it was, shows the Lambda/Oxygen/O2 sensor value.
This always shows 1.0, with engine off/running/idle and whether lambda sensor in plugged in or not. The same happens with the replacement too. Should this not be fluctuating as it reads the O2 present in the exhaust?
If somebody could confirm this for me, I think that would narrow it down to an issue with the wiring from the ECU to the lambda sensor plug in the engine bay....
 
   #17  

avisonjohn

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OK, so after letting the car warm up for a few minutes (original lambda sensor installed), the MVB started to change.

The balloon popup says MVB 40.4 should be between 1.000 and 2.000, but mine is sitting between around 2.39

Would this indicate a faulty lambda sensor?
As I am writing this, I heard what sounds like a small fan kick in and the MVB now reads 5.88....
I press the accelerator gently for a brief moment and let go, and it drops to 2.49 and the fan like noise stops instantly
 
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