2006 XC70 checking engine light came on code p0089 engine pressure regulator is this the same as fuel pressure sensor that is on the fuel rail?
Thanks.

This is a nasty code. Yes, it relates to the fuel pressure sensor, but that is a relationship and not necessarily the cause of the code.

Some people have had luck with a new fuel pump, some with a new fuel filter, others with a PEM rebuild.

This thread never came to completion but makes for good reading:

http://www.matthewsvolvosite.com/forums/viewtopic.php?f=9&t=60951



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Keeping it running is better than buying new

Changed fuel filter & fuel pressure regulator but the CEL kept coming back after clearing the code. Ordered a fuel pump then the day before arrival of the part the CEL went off ?? (don't you just love that) CEL came back on a few days later then while driving the CEL went away, did not install the new fuel pump, the CEL now has not come on in the last several months. Thinking it might have been some bad fuel on a out of state trip.

I checked around, go replace the fuel pump and see if that solves it. Seems to do the trick.

Klaus
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Keeping it running is better than buying new

You could check the connectors at the PEM in the back of the car. The PEM monitors and controls fuel pressure and has a tendancy to get wet.
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Keeping it running is better than buying new