Hi I have an 2006 XC90 2.5T
Question, so I had gotten my front O2 sensor changed like 3 weeks ago. As soon as I left shop my check engine came right back on but it was running super better. Fast forward a few days later to last week the car started running rough. I took it back to shop to see what it could be and the same codes as before were showing up again I was told to take it to Volvo. So this morning on my way to Volvo car just started and run for maybe like 10 minutes to warm since it so cold in North Carolina. It completely just shut off on me.

I was also told I had oil in my turbo 

I just changed sparks plugs like 4 months ago 

I brought a new coil pack/changed that one out and also one it stuck to where no one can get it off. 

I brought this car 2 years ago pervious owners have it to they’re son who didn’t take care of it oil hasn’t been changed in I don’t know how long I finally got it changed never flushed. Looked muddy and thick like water 

electrical problems

one low beams didn’t work but high beams does. Now both low beams doesn’t work. Left signal also doesn’t work I was told from previous owners if I buy the car for an $1000 from them I would need to replace ecm which why they haven’t Volvo would charge them $3000 to do so. So far I put on new rotors brakes pads changed out gas filter oil filters changed ac motor and gotten the te ac fix. But running better since then till I got the o2 fix then it been going down hill ever since I don’t have money to get a new car so my question is what can I do and I also heard a pop when I started the car yesterday morning from where the o2 was replaced at