- Buick Ownership
Going to work this morning 60 mph on the freeway I noticed the tachometer not working. Car run ok. Just now car started up fine and teach was off for 5 miles then came on but dropped to 0 for a split second before shooting back to 1600 RPMS. 60 MPH cruise control on. Did this about 5 times. Car ran fine. No SES. I keep reading that perhaps the crankcase position sensor is potentially failing.?