Okay so cable arrived today, downloaded the lite version but couldn’t get it to work. Would t accept any of the Com settings. So I’ll have to do some reading up. 
but I managed to test the expansion tank plug. Tried it a couple of times with the prongs from multi meter, with power on the fault only came on once. (Think the multi meter prongs weren’t fully in contact). Grabbed some wire, and secured it inbetween the two contacts. Ignition on for a good minute or so and no warning light. Started engine for a couple of minutes. Again no warning noise/light. 
would that mean the sensor on expansion tank? 

Sorted the connection issue. 

can you make sense of any of them codes in the pictures? 

 

Either the expansion tank sensor prongs, or there's something amiss about your coolant.  Does it look nice and clear and pink?

 

Try the following experiment the morning after you next drive the car. With the engine stone cold, remove the cap of the expansion tank whilst listening for any hiss of escaping pressure. It's usually readily audible if there is residual pressure, as long as there aren't too many background noises going on.

 

Your post above came in while I was typing the above, so all I'll say so far on those codes is that it's interesting that there is one from the coolant temperature sensor circuit.  My neck isn't quite flexible enough to study them properly just now.

 

Oh, and good effort getting VCDS up and running so rapidly.

 

Edited 14 May, 20206 yr by Wino

Coolant looks fine, we changed the rad and coolant sensor a year or so ago (hasn’t done many miles until the last few weeks) so coolant was replaced then. 
I’ll  check for the escaping pressure in the morning. Been using the car this week and up early so not much noise going on. If there’s pressure build up, that would indicate a blockage or partial blockage somewhere, right? 
I’m certainly more familiar with aircraft systems than cars. Lol 

16 minutes ago, Gille88 said:

If there’s pressure build up, that would indicate a blockage or partial blockage somewhere, right? 

No; but do the experiment first, you may not need to know!

Okay. I’ll do it first thing before I go to work. 

Okay carried out the experiment this morning. Didn’t notice any noise of air coming from The tank. 

That's good news. 

When there is residual pressure in a stone cold system it tends to indicate head gasket failure.

 

That can/does result in coolant contamination which would tend to change its conductivity one way or the other. It's also a very common failure on the 1.4 mpi engines.

 

You don't seem to have such a fault though. ☺️

 

As per another thread I've just posted in I'm planning tomorrow to investigate the threshold resistance that does/doesn't trigger the warning.

 

 

I’m thinking of trying a new coolant reservoir. But I’d be intrigued to find out how VW/Audi eradicated the fault from the later models. I seem to remember something about a temperate sensor upgrade which had 4 wires instead of two. But there’s a reason I work on airframe and engines...can see those leaks. Damn wiggly amps. Lol

Do you mean a new one or another new one? I thought you'd already replaced it?

Sensor in tank is only level, not temperature. 

 

Yeah.
The reservoir was changed before we got the car by a garage, we’ve changed the rad and coolant temp sensor. 
The thermostat was also changed by the garage but we don’t know 100% of the work was done. (The car was originally for my sister as her first car) now it’s my other half’s, for her first car. (Still only 67k on the clock) 

I didn’t know of the best course of action would be replace the lot for all the same brand stuff and start from scratch. 

Try reading fault codes from module 17, Instruments, and see what it says.

Did that before whilst looking at a few things today including cleaning some connectors. 

instruments came up with 2 faults. 
1) 00896-Trunk lock unit

2) 00893 (wouldn’t tell me that one without registering)

 

Engine Module 1 fault 

16522- Lambda sensor B1 S2. 
 

 

Okay. So been running the car for about 2 weeks now. Had an engine management light come on so plugged in and scanned the engine and instrument modules. 
Only the two codes and neither seem related to the coolant system. So no ideas why the light still comes on. 
Any ideas?