Ok so i have an Audi A4. Been fixing the sob since I bought it and it has some quite annoying issues

Let me start by saying I'm not a mechanic, my dad is, idk everything, tbh i hardly know anything 😂

I changed the fuel pump after the old one gave out, ever since I've had a gas leak, i think it's the return line but i don't know for sure

I also replaced the starter relay and my starter and sometimes the starter won't turn and i just get the relay clicking and other times it'll turn just fine.

The car does not register my driver side doors sensors anymore, usually when i open a door the dash will show that the door is open, it no longer does this.

My anti theft system is going haywire, i can no longer lower my windows or even open my trunk using the switch on my door, sometimes even the alarm goes off while driving.

The car burns oil but it doesn't do it quick by any means, it's an old car, so I've kinda just dealt with it by adding oil when needed.

My komfort module was just recently swamped under my seat, before i dried it and cleaned the contacts and removed all the water out from under my seat there was a major slew of issues, all the lights on the car would just turn off, sensors would be tripped all over the vehicle, it was horrible. Luckily drying out and cleaning it has removed these issues, but there are still many issues that need attention. Like my ecp is going off, i haven't gotten around to cleaning my throttle body. I'm quite lazy 😅

I'd appreciate any help or advice you could offer. The car runs great, just has it's issues.