Cutouts for turn signals on pre facelift cars are the same as for later cars and they are not the problem because later cars have bigger trims which goes under them to fill the gap for smaller turn signal lights. Compare a fender from early and later cars and you will see that they are the same...ex...

Probably because of a carrier/frame which holds headlights,turn signals,radiators and horns. Openings for them are bigger for early cars since headlights and turn signals are bigger. You can swap whole front end (headlights,turn signals,bumper)between early and later cars as long as you have matched...

I have a little dent on front passenger fender and found locally a perfect matched color fender from early car to swap it when i have time.
I also had doubts will it fit...but when you compare it closely...it is the same...minus a narrower trim...which can also be swapped from my fender.

You didn't mention intake manifold removal on 1st post.
That would be the 1st suspect.

A3 is diagnostic port for abs.
Engine codes should be read from A2(ecu) & A6 (ignition module).

Check Bosch part# from your old one.

Compression test will tell you something and not telling you anything....leaving you to chase your own tail. That said....if oil control rings are shot...compression will still be good but it will pouring oil into intake through pcv system. Testing should be more intense...compression,leak down,dry ...

When there are fault codes stored in TCM module,they don't reset with battery disconnect like engine ecu. You will need at least VOL-FCR or 850app to read & clear the codes to see what's going on. Why did you replaced TCM at first place? Does the orange arrow flashing or it just stays on? When T...

Doesn't matter if wheels are balanced recently. Could be bad tyres or bent rim(s). I had a vibrations you mentioned after fitting a brand new summer tyres. After fitment i had vibrations around 90km/h...2nd balance around 100km/h...3rd balance after 110km/h...4th balance around 120km/h. Balancing ma...

There are so many tyre shops which doesn't remove old weights before new balancing...they just add more if needed...resulting in bad vibrations which was hardly noticeable before balancing.
Now....i just visit one or two tyre shops because of that and avoid others.