Service Tire Pressure Monitor
Any Ideas? I have a 2008 Cobalt with 15 inch steel wheels. 89K on the car. Service tpms came on the speedo and showed no reading for the left front wheel and the yellow tire flat light came on. It would stay on after hitting a bump, but after being parked overnight it would go away until I drove about 20 miles. This went on for about 2 weeks it would be off and on. I had the left front sensor and valve stem replaced this morning with a Dorman unit #974-009. 5 minutes after I left the tire shop the light and warning were back on. I have never had the battery go dead or any other electrical issues. What gives?