Sorry to mix a little P2 problems over here but i'm stumped. I posted this a couple months ago in the P2 section but no one could suggest anything i haven't already tried. Here's the story, getting low coolant warning on S60. Son did loose a good amount coolant due to a bad small hose leak but never overheated. Replaced hose and refill and still getting warning. Replaced the expansion tank with a Behr and bought 2 OEM coolant level sensors from FCP. Light still on trying both sensors. Put one of the sensors on my S70 and no issues so i know they are fine. Thought maybe i got a bum tank from MFG so i swapped it out even though the float was operating correctly. New tank made no difference. Checked voltage at the harness that plugs into the sensor and getting 12V. I'm completely baffled. I don't like cry wolf error messages especially with something as important as coolant level.