cliffcoggin

Any comment on the above responses Jake? I know you have seen them.

You think so, or you know so? What other companies have you contacted?

There are several company's doing this sort of work. ECU Testing is one that comes to mind.

It could be any number of things from the sparse information you have given. The only way to know is to have it diagnosed with a code reader and maybe some measurements of such things as injector flow rate and compression.

The best way to achieve the comfort of a Q5 is to buy one, and get rid of the SQ5.

That's gratifying to know. It's possible that repairing the driver's door wiring will restore operation of all the other doors/windows/mirrors, however it would still be worth checking inside them all including the boot lid.

Vagcom I guess is from VAG (Volkswagon Audi Group) so presumably is equivalent to VCDS.

I can't help on that score. A current similar thread came across the same problem and was lucky that repeated attempts at the door handle eventually worked. Note that a new door lock may need to be effectively coded to the car. I am not sure.

VCDS is a high quality scanner that plugs in to the OBD port of the car. It is connected to a computer for scanning of fault codes and diagnoses. There are a few other decent code readers available which are usually used by professionals. There are many cheaper code readers available that are aimed at domestic users, but they generally don't have the discrimination of better units which means they mislead users with wrong codes. I recommend you either buy a good quality equivalent or get the car diagnosed professionally. Don't waste your money on cheap readers.

A good decision. Did you phone the garage?

That's up to you, though I'd still check the other doors. They may not have been used as much as the driver's door, but brittle insulation will affect them all.

The driver's door lock is indeed the master lock, however the A3 is known for broken wires in the rubber bellows between doors and pillars. I suggest you remove all the door cards and inspect the wiring.

That's good news. WD40 should not be considered a long term solution because it congeals, so I suggest you add some ordinary mineral oil.

What further assistance do you need? If the car can be driven it can be taken to a garage for scanning with a code reader such as VCDS.

Getting access is half way to solving the problem, so that's a good start. You should examine every part of the linkage between handle and latch looking for slack connections as well as breaks.

Given that we have only seen a couple of small photos, whereas the professionals have examined the real thing, I can't blame you for taking their advice in preference to ours. The ultimate decision however rests with the next MOT test. When is that due?

I don't understand the logic of fitting secondhand parts of unknown condition as a way of diagnosing what is wrong with your car. If the car still judders with the replaced part does that tell them they have replaced the wrong part or that the replacement itself is worn out?

Were the above comments helpful Hugh? I know you have seen them.

If the noise can only be heard when driven then it's reasonable for mechanic to want to drive it. As for the £108 charge, it's a lot cheaper than an Audi dealer.

It was necessary I would expect a decent garage to have done it. It wouldn't hurt to phone the garage and ask.

Perhaps Dean and Paul it would help to look through the relevent section of the forum for that marque to see what problems owners face, though bear in mind only bad news is written there. We rarely get to hear the good news.

The function of the EGR (exhaust gas return) valve is to pass some of the exhaust gas back into the engine in order to reduce emissions enough to meet modern criteria. Removing the EGR will thus increase emissions, though whether that increase will lead to an MOT failure I do not know.

I am surprised. The Audi and the Skoda I am familiar with have that light on all the time.

Cleevely has one the best indendent EV reputations in Britain and is in your region. It would be worth asking there. https://www.cleevelyev.co.uk/

Fair enough. I thought you wanted one as a donor for parts.