Threw in the towel an got a new ETM 199 gbp from Newcastle volvo and 87 euros software Valencia volvo, I was originally quoted 770 euros from another volvo dealer so just under half price. The sacer didn't work out for me but I learned a lot thanks to all for all help and tips and keep up the good ...

I'm on it and will post results thanks for the imput

Excellent response. It's great when you don't receive the answer you want to hear but it's what I needed to hear, clear and precise from someone who knows exactly what they're talking about, I can now stop messing around with the old ETM and get on with finding a new or newish one.
Will the yellow ...

Is there anway to test the PCV/breather system? How did they know it was malfunctioning? and why on earth can't the contact strips on the ETM just be replaced? they seem to pop out and slip back in, mine's a 2001 with 248,000 km and just recently started to die not bad going but they could do better.

Hi I have a 2001 v70 2.4 and have the same problem, I replaced the tps with the sacer and the same erratic idle, limp home mode etc...
Did you ever solve your problem as I am now in the same boat. I got these codes from volvo before tps change ECM 9150, 91b7, 532d, 620a, 903f, 9160, 91f0 and 980f ...