Sneaky McC

Well, I still haven't had the chance to check the fuelling Paul, but someone scanned the fault memory on VagCom today for me. We read the memory, cleared it and I went for a drive on mixed roads and then read the memory again. When the car wont start, a dab on the throttle gets her running. Does this lend weight to the fuel pressure Paul?

VAG-COM Version: Release 504.1-UD
Chassis Type: 4D - Audi A8 D2
Scan: 01 03 08 15 16 17 35 36 37 45 55 56 65 76 02

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 4D0 907 557 A
Component: 3,7L V8/4V MOTR AT D03
Coding: 04153
Shop #: WSC 00000
5 Faults Found:
17978 - Engine Start Blocked by Immobilizer
P1570 - 35-10 - - - Intermittent
17916 - Idle Control Sys: Upper Regulation Limit Reached
P1508 - 35-10 - - - Intermittent
16538 - Oxygen (Lambda) Sensor B2 S1: No Activity
P0154 - 35-10 - - - Intermittent
00561 - Mixture Adaptation
15-10 - Adaptation Limit (Add) Not Reached - Intermittent
01088 - Mixture Control Adaptation 2
15-10 - Adaptation Limit (Add) Not Reached - Intermittent
Readiness: N/A

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 4D0 907 379 N
Component: ABS/ASR-EZ BOSCH 5 7408
Coding: 00002
Shop #: WSC 02314
No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC
Controller: 4D0 820 043 B
Component: D2-KLIMAVOLLAUTOMAT_D03
Coding: 00081
Shop #: WSC 02314
No fault code found.

-------------------------------------------------------------------------------
Skipping Address 15-Airbags



-------------------------------------------------------------------------------
Address 17: Instruments
Controller: 4D0 919 035 C
Component: D2-KOMBIINSTRUMENT__D18
Coding: 00483
Shop #: WSC 00002
No fault code found.

-------------------------------------------------------------------------------
Address 02: Auto Trans
Controller: 4D0 927 156 G
Component: AG5 01V 3.7lV8 RDW D59
Coding: 00000
Shop #: WSC 00000
1 Fault Found:
00526 - Brake Light Switch-F
27-00 - Implausible Signal

End --------------------------------------------------------------------------------------------------



The memory was cleared and then I went for a 20min spin, a mix of hammering along the A40 (The Free Way) :Secret: and bimbling around town, this was the second reading:



VAG-COM Version: Release 504.1-UD


Chassis Type: 4D - Audi A8 D2
Scan: 01 03 08 15 16 17 35 36 37 45 55 56 65 76 02

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 4D0 907 557 A
Component: 3,7L V8/4V MOTR AT D03
Coding: 04153
Shop #: WSC 00000
No fault code found.
Readiness: N/A

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 4D0 907 379 N
Component: ABS/ASR-EZ BOSCH 5 7408
Coding: 00002
Shop #: WSC 02314
No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC
Controller: 4D0 820 043 B
Component: D2-KLIMAVOLLAUTOMAT_D03
Coding: 00081
Shop #: WSC 02314
No fault code found.

-------------------------------------------------------------------------------
Skipping Address 15-Airbags

-------------------------------------------------------------------------------
Address 17: Instruments
Controller: 4D0 919 035 C
Component: D2-KOMBIINSTRUMENT__D18
Coding: 00483
Shop #: WSC 00002
1 Fault Found:
00771 - Fuel Level Sensor (G)
30-10 - Open or Short to Plus - Intermittent

-------------------------------------------------------------------------------
Address 02: Auto Trans
Controller: 4D0 927 156 G
Component: AG5 01V 3.7lV8 RDW D59
Coding: 00000
Shop #: WSC 00000
1 Fault Found:
00526 - Brake Light Switch-F
27-00 - Implausible Signal

End --------------------------------------------------------------------------------------------------


Can anyone glean any info from this data for me?

KMU

take a look at a couple plugs. Just guessing you'll find them fouled. Would suspect improper fuel mix commanded by the computer from vacuum leak, improper signal from one or more o2 sensors or the wiring to them. Again, just guessing.

Sneaky McC

It occasionally runs lumpy when it didnt want to start. Normally runs fine. I will take out the plugs next week.

I have read that there can be a connection between gear box trouble and a brake switch?

I have been advised to clean the throttle body.

I'm not sure what to do about the Lamda?

Any advice?

;-)

Jkay

BEFORE you run the VAG-COM, you must depress the brake pedal once.

You forgot to do that, and got the fault.

Jkay

... I'd check your O2 sensor connections. The code says they are intermittent? Normally they just go bad, not flip on and off. Maybe a bad connection. Engine Rich/Lean errors can be related to the intermittent O2 sensors.

Also, the Immobilizer code .. that's the 2-second run, then die thing. I'd follow other people's advice, so far, and check your ignition switch assembly for a bad connection!

Sneaky McC

Thanks JKay, I'll give this a try. Has anyone got a diagram? ;-)

Regarding the brake code, you're correct. I didn't realise that the pedal would need pressing.

Thanks again,

Sneaky

PaulW

But if all you need to do is to give it some throttle, it's not the fuel pump. Nothing would start it then.

These are the codes I would be worried about:

17916 - Idle Control Sys: Upper Regulation Limit Reached
P1508 - 35-10 - - - Intermittent
16538 - Oxygen (Lambda) Sensor B2 S1: No Activity
P0154 - 35-10 - - - Intermittent
00561 - Mixture Adaptation
15-10 - Adaptation Limit (Add) Not Reached - Intermittent
01088 - Mixture Control Adaptation 2
15-10 - Adaptation Limit (Add) Not Reached - Intermittent
Readiness: N/A


Plus, if your immobilizer blocked the ignition, it wouldn't work.

Sneaky McC

Thanks Paul. Any offers on where I should start?

:-(