One problem related to tire pressure monitoring system has been reported for the 2008 Mazda CX9. The most recently reported issues are listed below.
The contact owns a 2008 Mazda cx-9. When the weather is cold the front passenger right tire lost pressure and increased from 32 psi to 25 psi. He replaced the tire on one occasion and that did not correct the failure. Air was added to the tire on several occasions by a local repair facility and on two occasions by the dealer. The dealer stated that the tire pressure sensor valve monitor was defective and has caused the tire to lose pressure. The estimated cost to replace the tire pressure sensor valve monitor was $300. 00. He contacted the manufacturer and filed report number 127407340. The manufacturer stated that they would not assist with the cost to replace the tire sensor monitor. The failure mileage was 16,000 and the current mileage 36,000.