Hi all, I adopted another S70 last week, a 1999 S70 T5 with 70K on the odometer, and looking very clean inside, under, and out. The check engine light was on when I first looked at the car, so I "test drove" it to my house and hooked up my OBD2 system, and the codes read "P1171" and "P1174," "System too lean." I figured it was just a bad MAF, since my other S70s have had the same codes with MAFs going out.

I ended up getting it for a really good deal, using the check engine light being on as a negotiating point, figuring I knew exactly what was wrong with it. Well, I went to the dealership that is closest to us to pick up a new MAF, and I went ahead and asked them to do the T-belt and accessory belts since they had not been done yet, and I wanted it done as PM. I also asked them to confirm the MAF diagnosis I had made...

After they finished the T-belt (can you believe they did it in less than an hour!?!? Took me 3 hours on the one I did myself on a '98), they hooked up the computer, and they got different codes of course, but theirs were more along the lines od indicating that a nipple under the manifold was clogged. I let them go ahead and clean it, which apparently required removal of the manifold. They reset the check engine light, and it appeared fixed.

Well, on the way home the check engine light came back on, again reporting as "system too lean." I ordered a new MAF, put it in, and the light has been off since. My reported average MAF readings on the OBD2 are also much higher than previously (now at average 1.2 under city driving, and 0.75 at idle, with max of 2.4 and min of 0.2; earlier values were never getting above 1.5 or so).

Anyways, it appears to me that the S70s just need new MAFs ever 60K or so. Has been true for 2 of the 3 S70s I have had (one of which is not yet at 60K, at least it was not when I sold it 6 months ago, but I bet it will be 3 out of 3 here in the next year or so). Fortunately they don't cost much, only $157 wholesale, $210 retail, at least at the dealerships I have used.

Don't know if this helps anyone! I love the S70s, thats why I keep adopting them, but they do have their quirks:)

Thanks,
Vos