Just to let you guys know, car got fixed. It was the MAP/ boost pressure sensor....#4 in the diagram y'all provided. Part 3s are 9125462 and the other part # 0261230029...Don't which is the Volvo part #.
So, evidently on my 2002 Volvo V70 XC AWD wagon the MAP doubles as a boost sensor. and part # 18 ...

I did trace the pipe(s0..no go. The MAP sensor in the middle of the pipe serves as the booster. I'm waiting for that part. I'll change it out and we'll see.

18 DOES NOT EXIST ON MY CAR...wrong diagram.

exactly..that's thepart on the right

Nope not there or anywhere else I can find. I believe my model (2002 volvo v70 xc AWD wagon) doesn't have this part. I ordered the #4 in the diagram above. This has the name of MAP boost pressure sensor. Hopefully this solves the problem. I actually consulted a guy who knows Volvos pretty well and ...

OK. Got the part. However, I cannot find where it goes. The neckwhere the number 6 hose joins is smooth...there's no sensor. Is it perhaps inside the neck...do I have to take the number 6 hose off to get at it. It certainly is not on the outside where the diagram above shows.

Thanks

Yes. That is the one I ordered.

I believe so...we'll see when I get it....

Yea. let's see when I replace the booster.