Just done a VCDS scan for a colleage at work with a Y reg mk1 Octavia vRS.

His engine warning light comes on every 7-10 days. His local garage have reset it but it keeps coming back. The throttle body has been changed as has the MAF. He said it started after he went up some bumpy farm track in it. He's wondering if it's some sort of loose connection as it will stay off for a week or so then come back again. He says it seems to be running fine and not really using more fuel than normal. His journey to work is only 7 miles each way.

This was the result from Module 1:

17545 - Fuel Trim: Bank 1 (Add)

P1137 - 35-00 - System too Rich

I've just had a quick search and past problems with other member's cars seems like it's a split or popped vac hose, or lamda sensor?

I don't think his local garage has VCDS just a hand-held ODBII scanner.

Any other comments or advice?

Thanks

Martin

Might be worth checking the pre- and post- cat lambda sensors aren't loose or the wiring to them is damaged.

The code can also come up if there are problems with the fuel rail, injectors and FPR, or the EVAP system, that's quite a bit of stuff to check but any of it could have come loose

Might be worth checking the pre- and post- cat lambda sensors aren't loose or the wiring to them is damaged.

The code can also come up if there are problems with the fuel rail, injectors and FPR, or the EVAP system, that's quite a bit of stuff to check but any of it could have come loose

Thanks for the quick reply. At the risk of being thick (and my Haynes manual is being borrowed by another mate at the moment ) where are they exactly?

I've also got a vague feeling that I've read that a new throttle body has to be "calibrated" or bedded in with VCDS - is that right or have I imagined it?

17545/P1137/004407 - Fuel Trim: Bank 1 (Add): System too Rich

Possible Symptoms

• Malfunction Indicator Light (MIL) active

Possible Causes

• Mass Air Flow (MAF) Sensor faulty
• Fuel Pressure Regulator faulty
• Fuel Injector(s) faulty
• Oxygen Sensor Control faulty
  • Oxygen Sensor(s) faulty

  [*] Evaporative Emission (EVAP) System faulty

Possible Solutions

• Check Mass Air Flow (MAF) Sensor
• Check Fuel Pressure Regulator
• Check Fuel Injector(s)
• Check Oxygen Sensor Control
  • Check Oxygen Sensor(s)

  [*] Check Evaporative Emission (EVAP) System

<a name="Special_Notes" id="Special_Notes">

Special Notes

• Fuel Trim Information

And yes, when the throttle body has been removed you need to do a TBA (Throttle body alignment)

Thanks Gizmo. And what would be the symptoms of not doing a throttle body alignment? If the garage hasn't got VCDS then I'm assuming that this hasn't been done?

All the wiki says is the engine may not run correctly or at all, sorry I can't be of more use but I have not owner a petrol VAG so have not needed to perform a TBA.

Thanks for the quick reply. At the risk of being thick (and my Haynes manual is being borrowed by another mate at the moment ) where are they exactly?

Fuel rail, injectors and FPR are along the front of the engine once you take the cover off.

EVAP system - follow Rob's pics and diagrams: http://www.pimpmyskoda.co.uk/V2Images/ModsEngine/EvapSimplify.htm

I'd assumed the garage would have done a TB adaptation if they'd fitted a new throttle body but if not then I guess the car could be over or underfuelling because the ECU hasn't got an accurate idea of how far open/closed the throttle plate is all the time.

You could try a TBA yourself with VCDS, I think it has to have any fault codes cleared and the coolant has to be cold before you do it though.

No need to do a throttle body adaptation as it will self adapt over a few driving cycles.

Log block 032 and post back the results...

http://www.ross-tech.net/vag-com/advertising/DiagnosingA_MAF_TechTip.pdf