CUSTOMER CONCERN The coolant-temperature gauge reads full hot and the combination meter stores DTC B1503. The exhaust temperature switch has already been replaced, but the code immediately returns and both switch wires measure 0 volts with the switch disconnected. CAUSE Rodent damage chewed through the exhaust-temperature-switch wiring beneath the vehicle near the floor area. CORRECTION Repair the damaged exhaust-temperature-switch wiring, clear DTC B1503, and verify the temp

CUSTOMER CONCERN The check-engine light is on with DTCs P0546 and P1081 stored. CAUSE Circuit testing confirmed an open Bank 1 Sensor 1 exhaust-temperature sensor. The exhaust flap valve moved freely and operated as designed. CORRECTION Remove and replace the failed Bank 1 Sensor 1 exhaust-temperature sensor.