Hello Duke,
The v across battery posts with engine off (12.35 with alarm light flashing0)seems a bit low compared to my 740 volvo's 12.6(no alarm)
Is the sender unit on the oil filter housing itself or more near the firewall.Is it simple diy: a disconnect -loosen - replace- tighten- job.,as easy as oil filter change?
Do I need the oil filter off?likely
Do i need the air filter cover off? as i searched and found.
Thanks
Tom

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Tom 2010 C250 4-matic Sport (Canada)