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Stumped on CODE P0172 (system Rich) @139K S70 1998

posted by  P K Bodyman on  Tue Jun 8 10:45 CST 2010
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last visit: Tue Jul 16 07:52 CST 2013
[RELATED]

A vacuum/boost guage would be nice! The crazy thing about that vacuum cap on the tee, it was the first place I started looking. After hours/days/weeks of removing parts & searching vacuum hoses & lines for leaks and replacing suspect parts, I found the uncapped nipple. A week later the code reset and I found that the new 1/8" rubber cap was gone again. This time I applied a little glue and another new cap. Klaus, if vacuum is negative pressure, could/does the turbo boost cause positive pressure and "blow" the rubber cap off? It still runs great, 26mpg, idles smooth, no problems. Just wondering!






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