you are covered for the ETM problem multiple times if within the 10yrs/200,00 0 mile limit. There should be no dealer charge for the diagnosis/service.
There was a recall for that fan problem for my 2000 S80. Not sure if it applied to your car too. Ask the dealer about that too if you never had a ...

Vizigot, If the software update does not compensate for the faulty ETM, the dealer is supposed to replace the ETM. Has that been done yet?

Arthur,
Sorry, but there is no easy way to replace the MM unit with the Bosch. The design philosohy and the interface to the Engine Control Module would, at a mininum, require replacent of the ECM. You had a Bosch unit go bad. I know of no reports of design defects in that unit. It is a very ...

Arthur,
I suggest you look at the ETM and get the label info off it. It's directly under the center of the intake manifold and you may need to do this with a mirror on your car. Try to get the manufacturer, P/N and date code. Affected ETMs are made by Magneto Marelli, P/n is 7 digits under top bar ...

Code P1610 translates to Volvo code ECM 903F, which you will find in the reference Bud gave you under tech net notes 25-149A, where the code is prominently mentioned as an ETM failure indication. Drive the code in to a dealer if you can.

Just did a Google search on your code and lots of folks had this code with a bad Mass Air Flow (MAF) sensor. Try unplugging the MAF connector and see if it cleans up the connector, or idles better with it unplugged. I think your car substitutes a default value when it's unplugged

P 1171 is probably not related to ETS. Check your vacuum hoses and air intake hoses for a leak.

Fishfool,
We need more info from you. Which Volvo, year, model? Did the problem repeat or was it one solid failure? Was the code reset and then reoccurred?

For an S80 T6, there is a dealer procedure posted by Don Willson here: http://www.vexedvolvo.org/ which tells the dealer to follow the 901E ...

Don,
A friend who used the Memphis address you posted on this board also got
a check today. He also sent his dealer receipt and a letter and waited many weeks. Maybe the dam broke.
Larry P.

My tendency would be to believe the original dealer diagnosis, ETM, and follow your plan to beat on them and Volvo over that. MAF failure has unique codes.
With MAF disconnected and ETM failing, you have two interdependent engine components running on special (substitute) code and interacting. Who ...