First VCDS scan - couple of errors.

[AntGTD]

Evening,

First VCDS scan since buying the Golf 10 days ago and there was a couple of fault codes, once cleared the only stubborn one was - 20010 - Oxygen (Lambda) Sensor B1 S2 which took couple of rescans and a drive round the block to clear. I've done 5-10 miles since and its not reappeared yet.

I am on my second tank of fuel and am averaging 42MPG which is frankly shocking especially as my MK6 GTD would average 48-50MPG!

If the error code hadn't been cleared after the Lamba sensor had been replaced would this impact the fuel economy?

-------------------------------------------------------------------------------
Address 01: Engine (J623-CUNA)       Labels: 04L-907-309-V1.clb
   Part No SW: 04L 906 021 EP    HW: 04L 907 309 A
   Component: R4 2,0L EDC   H22 6283 
   Revision: 81H22---   
   Coding: 01190012034505082000
   Shop #: WSC 01357 011 00200
   ASAM Dataset: EV_ECM20TDI01104L906021EP 002006
   ROD: EV_ECM20TDI01104L906021EP_VW37.rod
   VCID: 77FD8AFECE74F78667-8023

1 Fault Found:
20010 - Oxygen (Lambda) Sensor B1 S2
          P0136 00 [032] - Malfunction in Circuit
          Intermittent - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:

Readiness: 0 0 0 0 0

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

[dv52]

Lamda is a fundamental measurement of  the Air/Fuel ratio - so the answer is yes
Ross Tech wrote a good simple to understand article on this very issue (see link below)

http://wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info

PS: When you take back the car to the dealer, might be prudent to ask them how they do their pre-delivery checks (why didn't they find the DTCs? before they smiled as they accepted your final payment?)

[p3asa]

PS: When you take back the car to the dealer, might be prudent to ask them how they do their pre-delivery checks (why didn't they find the DTCs? before they smiled as they accepted your final payment?)

Could be wrong but his signature says 2013 Mk7 so maybe just new to him.

You'd be crazy to pick up a new car so close to the New Year unless it was a lease

[AntGTD]

Bought the car from an independent and managed to get a pretty good deal with a £500 discount, on saying that i did break my first rule of viewing a car which is not to do it in the wet. There are a couple of minor bumper scratches but these are being addressed next month by the dealer by smart repair.

Don't worry i will be asking the why the DTCs were not addressed

[dv52]

PS: When you take back the car to the dealer, might be prudent to ask them how they do their pre-delivery checks (why didn't they find the DTCs? before they smiled as they accepted your final payment?)

Could be wrong but his signature says 2013 Mk7 so maybe just new to him.

You'd be crazy to pick up a new car so close to the New Year unless it was a lease

IMO pre-delivery checks by dealers are important regardless of whether the car is new, or "just new to the buyer". In fact, probably more important in a 2nd hand car. Car buyers should always ask for a copy of an auto-scan report (or ODIS equivalent) before handing over the final cheque - I think.   Then both the buyer and the dealer can smile to one another as the money is accepted!
Don

[AntGTD]

Genuinely believe the dealer (non VW franchise) forgot to check for DTCs. The car ran without fault when i drove it, the issues i have picked up are minor but need addressing and will be done under warranty.

I've had a few VWs over the years (10 i think) and apart from one which i handed back with a gearbox issue i've not had any issues which have not been resolved under warranty.

I tend to take Laptop with VCDS with me but forgot to this time round.

[p3asa]

IMO pre-delivery checks by dealers are important regardless of whether the car is new, or "just new to the buyer". In fact, probably more important in a 2nd hand car. Car buyers should always ask for a copy of an auto-scan report (or ODIS equivalent) before handing over the final cheque - I think.   Then both the buyer and the dealer can smile to one another as the money is accepted!
Don

Good point. I wonder though if any have ever done it. Although nothing to stop them clearing any faults and handing you that report.

[dv52]

IMO pre-delivery checks by dealers are important regardless of whether the car is new, or "just new to the buyer". In fact, probably more important in a 2nd hand car. Car buyers should always ask for a copy of an auto-scan report (or ODIS equivalent) before handing over the final cheque - I think.   Then both the buyer and the dealer can smile to one another as the money is accepted!
Don

Good point. I wonder though if any have ever done it. Although nothing to stop them clearing any faults and handing you that report.

Nothing wrong with the dealer clearing DTCs. If they are successfully cleared, then the fault would have been intermittent - probably would do that myself if I had the car, The serious permanent DTC,s won't be cleared and would still appear on the scan report though

[fredgroves]

I'm no expert VCDS but my understanding is that the very complex network of computerised components do throw a whole load of transient error messages and that in the most part you can ignore them unless they are regular and linked to a physical manifestation of a problem...

They are a trouble shooting tool more than a finite definition...

On my old (non-VW) car, the garage found several errors after i had a massive power loss problem. They changed some things out and it wasn't that - the actual problem was one thing which created a series of different error messages across the engine, which if you took them individually at face value, it was about 6 bits that needed swapping... when in fact it was one broken thing. They found it in the end, but only after swapping several others. Its just another set of diagnostic info that may help you find a problem, not a magic wand.