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Air Cleaner Temperature Sensors

The air cleaner temperature sensor monitors the temperature of the air circulating through the exhaust system. It sends information to the engine control unit that, in turn, regulates exhaust recirculation. The sensor is located in or near the air cleaner assembly. It can be tricky to know whether the sensor is faulty or if there is a problem somewhere else in the exhaust or air filtration system. The sensor is easily removed and then it can be tested. Test the sensor with an ohmmeter and a hairdryer or some other heat producing element. Take measurements when it is cold and then again after it is warmed up. The vehicles service manual should list proper operating ranges for the sensor. If the measurements are in the range, try resetting the car’s computer by disconnecting the negative battery charge for five minutes or so. If that doesn’t do the trick, try replacing the sensor.