Hi,

Can anyone offer advice on the following? A mate has a Octy 1.8T estate, a recent purchase. It had a service, but the remider wasn't reset, so I did that for him, and also did a fault code read. There were a few:

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VIN: TMBFL21U41845XXXX Mileage: 109930km/68307miles

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Address 01: Engine Labels: 06A-906-032-AUM.LBL

Part No: 06A 906 032 FC

Component: 1.8L R4/5VT G 0002

Coding: 11500

Shop #: WSC 10001

TMBFL21U41845XXXX VWZ7Z0A088xxx

3 Faults Found:

17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)

P1297 - 35-10 - - - Intermittent

17545 - Fuel Trim: Bank 1 (Add): System too Rich

P1137 - 35-00 - -

16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit

P0130 - 35-00 - -

Readiness: 0000 0000

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So, I'm guessing the dump valve might be shot for a start, as they are a common item. Any advice on the others? The car has been intermmittently displaying the CEL.

As well, there's the following:

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Address 29: Left Light Labels: None

Part No: 1U0 941 651

Component: EVG GDL + AutoLWR 0002

Coding: 00017

Shop #: WSC 00000

2 Faults Found:

01042 - Control Module; Not Coded

55-00 - Adaptation Not Successful

01539 - Headlights Not Adjusted

35-00 - -

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Address 39: Right Light Labels: None

Part No: 1U0 941 651

Component: EVG GDL + AutoLWR 0002

Coding: 00017

Shop #: WSC 00000

2 Faults Found:

01042 - Control Module; Not Coded

55-00 - Adaptation Not Successful

65535 - Internal Control Module Memory Error

00-00 - -

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Which suggests that the light levelling controller is stuffed to me- or at least not coded, but that 65535 error usually means a screwed contoller, doesn't it?

Any advice?

17705 is very common and is quite tricky to pin point to one cause. 17545 is too rich at idle, this will trigger the light and could well be attributable to no.1 lambda probe, as this is showing a fault. Check the wiring and electrical circuit for no.1 probe and if OK it may need a new probe.

For addresses 29 & 30 I should think are for xenon lights, are these fitted? You could erase the faults and look into the coding options to ensure that they are correct and then try to put them into basic settings.

The 65535 usually does mean a screwed controller, it might clear, or you may have to replace the controller.

17705 is very common and is quite tricky to pin point to one cause. 17545 is too rich at idle, this will trigger the light and could well be attributable to no.1 lambda probe, as this is showing a fault. Check the wiring and electrical circuit for no.1 probe and if OK it may need a new probe.

I presume No.1 probe is pre-cat? How far down the exhaust am I looking?

For addresses 29 & 30 I should think are for xenon lights, are these fitted? You could erase the faults and look into the coding options to ensure that they are correct and then try to put them into basic settings.

I don't know it's got xenons: I'll have a look next time I see him.

I've cleared the faults: where can I find the coding options?

The 65535 usually does mean a screwed controller, it might clear, or you may have to replace the controller.

That's what I thought: is there any special trick to try to clear it, and any idea where it is physically?

Thanks for the help so far.

I presume No.1 probe is pre-cat? How far down the exhaust am I looking?

Between the exhaust manifold and the catalyst, you may be able to see it from the engine bay.

The give away with xenons is that they have igniter boxes with a high voltage warning on the back of the headlamps, also there will not be a manual level switch in the car. Advise on coding you can usually get from the label files, addresses 29 and 39 have no label files associated with them, I suspect that these are the units on each lamp, 29 - left, 39 - right. There may be a master controller for these, try address 55 and see whats there and if there is a label file with it.

It is possible, if you don't know the history of the car that it may have had optional xenons from new, which at some point have been replaced with standard headlamps.

With the 65535, I usually try erasing them and if it keeps returning, give up and advise that a new controller is required. I would have thought that the controller would be on or close to the right head lamp.

Between the exhaust manifold and the catalyst, you may be able to see it from the engine bay.

Cool. Thanks

It is possible, if you don't know the history of the car that it may have had optional xenons from new, which at some point have been replaced with standard headlamps.

Well, my mate was told it had xenons, so they are probably still there.

With the 65535, I usually try erasing them and if it keeps returning, give up and advise that a new controller is required. I would have thought that the controller would be on or close to the right head lamp.

I'll try that, thanks. For the moment I've cleared everything and next time I see him I'll rescan.

Presumably, running rich it has a chance of failing an emissions check, depending how severe it is?

The 'add' (additive) indicates that it is running rich at idle, the ECU has had to trim the fuelling and if it does it by more than +/- 10%, it'll throw a fault code. If it was doing it above idle it will say 'mult' (multiplicative). It could fail on the idle emissions.

I find that it sometimes helps to erase the learned values in the engine ECU, 01 engine, 10 adaptation, channel 00. This will in effect re-set the ECU, so it will re-learn the style in which the car is driven.

I have also known a throttle body clean was worked in bringing the adaptive values down.