Hi there
New to the forum so please excuse me, seeking some help pls

Audi a4 b7 2.0tdi cabrio

I bought this car damaged, front right chassis was repaired, engine required re timing for it to start. Done.

Body panels all put back, chassis straightened, new turbo new dashboard etc. The wiring to the turbo and maf have been soldered and insulated.

Roof works great, car drives like a piece of s&&t and i have a dashboard full of errors, looks like a xmas tree.

Glow plug light flashing
Brake light (!)flashing
Eml cel ON
Emissions warning (recently came on after all the others)
Airbags

The car will not rev up past 3000
The rear brake lights are constantly on

Had it connected on vag reader
P0245
P2002
P2100
P0684

I have spent £££££ on repairs already and was a silly mistake of mine to buy a damaged car and try to repair it. I donnot want to pay a mechanic anymore to try and pin point whats what and want to try and check and sort the niggly bits myself

Any suggestions highly appreciated on HOW I CAN GET THIS CAR TO rev/drive properly

Why are the brake warning lights flashing?? Check fluid level and absolutely fine.

Have checked wiring to the n75 turbo valve and its fine!

Checked fuses
Dont know where relays are located