I had to troubleshoot almost every system in my car over the last 6 months until I finally got to the ECU, which ended up being the problem. I wasn't trying to be a dick, just saying if $55 is all you have to spend you'd be lucky.

 

I know...but spending needless money never helps. A buddy just had his ecu go out. What was your symptoms?

 

PSM/ABS fault light on constantly. But my problem was a local tuner messed up my ECU when he tried to tune it by swapping chips instead of loading files through the OBD2 port. I didn't know that's how he tuned until after it was done.
Likely not your issue, lol, but I did a lot of troubleshooting before I tried another ECU and tune. So I will try to be helpful.

 

I have got those 2 lights since I bought the car, but only under sustained boost at 1 bar. Otherwise it never happen.

 

Definitely get a Durametric cable and software. It's the best tool you can have for these cars. The fault codes and data logging will point you in the right direction.

 

I will add, a bad N75 doesn't always mean complete failure, lower then commanded boost-but still 'healthy' pressure can occur as well
Jean-Marc might be onto something here as well...you have had PSM/ABS lights under heavy load/1bar+boost..? wonder if it's another MAF/load/tuning issue here eh Jean-Marc..?

 

I have gotten the maf code a couple times. Since I've cleaned it it has not come back. I was always under the impression mine went off due to a boost leak somewhere

 

Yeah Rob, it does sound all too familiar.
Except for the drive shaft removal issues the op mentioned in an earlier thread. That seems to be the start of all the problems.
I would get in touch with a few of the well known tuners on here and see if they can shed any light on that and maybe your subsequent problems.
From my experience, some tuners kind of see it as a challenge and enjoy getting these types of issues sorted out.
Maybe start a new thread with the history of the car, mods, tunes, symptoms, and what you've checked.

 

Again, I'd also replace the MAF, very sensitive sensor and cleaning is a Band-Aid at best...ECU needs to know its incoming air mass to make load calculations