U0666 engine code

[Tinker99]

thanks in advance for any help with this problem. New T6.1 1500 miles on clock, engine light came on a few days ago. Van drives fine but checked on code reader 2 errors both saying U0666.
Cleared the codes but they came back 2 days later. Any advice would be much appreciated.

 

[mmi]

checked on code reader 2 errors both saying U0666

What code reader? Anything else besides the code - no plain English "decoding"?

New T6.1

What's the engine code?

Just asking as the U0666 is not a recognised code at all on e.g. OBDeleven and neither seen on VCDS support forum.

 

[Tinker99]

I have a wired Foseal code reader. After the first U0666 code it says Manufacturer control $07e8. After the 2nd U0666 code it says Manufacturer control $07e8Pd.

Can't find any reference to those codes anywhere on the internet.
Bit of a strange one.

 

[mmi]

I believe you would get a different - more meaningful - code using VAG dedicated code reader.
$07e8 is just the address wherefrom ECU responses are read.

 

[JOG]

Witchcraft! Devil’s work!!!

 

[Tinker99]

In your opinion which would be the best VAG dedicated code reader to use?

 

[roadtripper]

One of Carista/OBDEleven/VCDS

Lots of conversations of pros and cons such as

VCDS vs Carista vs OBDEleven vs ??

Carissa or odbeleven? Looking at doing some basic programming ie auto locking etc. Would like auto mirrors but assume not available on my 16 plate shuttle se

www.t6forum.com

If you're not sure get a basic Carista - they're cheap and the first month subscription is free. If it works for you then just pay for the month when you need it. If you never use it again or you decide you want something more extensive you've not spent much.

You don't need the newer version if you only want VAG use.

 

[Tinker99]

So got a Carista its showing 2 faults, an OBD2 fault with the U0666 code mentioned before and a engine fault with the code 43307 (lost communication with reductant sensor)
Both of these codes will not cancel.
Engine is 2.0TDi 110

 

[Tinker99]

Took the van to a dealer and they changed a G686 pressure sender under warranty. Engine light now off so fingers crossed that was the problem. Thanks for all the advice on here.