Carrier/rack problems of the 2008 Mazda MAZDA3

When I attempted to remove valve stem cover the valve stem cracked and came apart. I had to have the complete tpms valve replaced. I then noticed that the other valve stems looked in the same condition. The Mazda dealer said that this was just aging and that the rest were o. K. I am not sure if they are. I said that the stems should not crack just by removing the cover.

Check engine light came on 12/13/14, car wouldn't start 12/14/14, had towed to repair shop 12/15/14 and was told engine was flooded because the car couldn't meter air correctly and over fueled the car. Spark plugs, air filter and throttle body were all gummed up and dirty due to this. Repair shop checked the technical service bulletin relating to the check engine light and found that this is a a known issue. They had to modify a bracket and splice in new wire where it was rubbed through because of this defect. If this is truly a common defect Mazda should issue a recall on it and reimburse owners who have already had to have it fixed.