I picked up my '56' XC90 SE lux end of November (08) . (loving it by the way) and after 3 days I got the 'On Call - Service required' message on the dashboard.
Went to dealer - they reset on call unit - problem went away then 3 days later message came back on. They did same again - and again 3 days later it appeared again!
Went to another dealer who diagnosed it as a fauty microphone, so it was replaced under warranty. 3 days later, same message again! (can u see a pattern here)?
So, went back again, diagnosed this time as the wiring harness to the Microphone - so they replaced it under warranty and its been 10 days with no message! Looking like the harness fixed it.
Yippie!
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