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.

CUSTOMER CONCERN Engine misfires under acceleration with DTCs P0302 and P0304. CAUSE Circuit testing confirmed a fault in the affected fuel-injector wiring. CORRECTION Repair the failed fuel-injector circuit wiring.

CUSTOMER CONCERN Customer states the air conditioning will not operate. DTCs B1419, B1421, B1424 and B1428 are stored. CAUSE The solar-sensor codes did not inhibit operation; circuit testing for B1419 confirmed a faulty connection at the rear junction-block ECU connector in the left rear trunk area. CORRECTION Repair rear junction-block ECU connector and terminal fit. Clear HVAC DTCs and verify air-conditioning operation.

CUSTOMER CONCERN Customer states the ABS, traction-control and brake warning lights remain on after brake-booster pump replacement and bleeding. DTC C1253 is stored. CAUSE The ABS MTR1 fusible link and pump feed circuit tested correctly, isolating the fault to Engine Room Relay Block 2/Engine Room Junction Block 2. CORRECTION Remove and replace Engine Room Relay Block 2/Engine Room Junction Block 2. Clear brake-system DTCs and verify booster-pump operation.