Even after replacing tires and a tire sensor replace on one tire. The light on dash stays on saying low air pressure. At first I thought it was due to cold temp outside. But even when it's warm out, light still comes on. Does it need to be reset some how, or does the dealer have to reset it? What can I do?
Low air pressure censor stays on on 2007 Ford Explorer Sport Trac
by jenjen78b in Corpus Christi, TX on January 08, 2011
ANSWER by surfer8210 , October 17, 2012
Many of us have purchased a tool on Ebay which shops use to reset the sensors. They DO NOT reset automatically as the previous poster wrote..!! It's actually a small magnet...and there's a procedure to follow... Sensor Training (Reset Procedure) NOTE: The tire pressure monitoring system is not affected by wheel and tire rotation. NOTE: The tire pressure sensor training procedure must be done on a single vehicle, in an area without radio frequency (RF) noise. RF noise is generated by electrical motor and appliance operation, cellular telephones and remote transmitters, power inverters and portable entertainment equipment. 1.Turn the ignition switch to the OFF position. 2.Turn the ignition switch from the OFF position to the RUN position three times, ending in the RUN position. Do not wait more than one minute between each key cycle. 3.Press and release the brake pedal. 4.Turn the ignition switch to the OFF position. 5.Turn the ignition switch from the OFF position to the RUN position three times, ending in the RUN position. Do not wait more than one minute between each key cycle. 6.The horn will sound once and the TPMS indicator will flash if train mode has been entered successfully. If equipped, the message center displays "TRAIN LF TIRE", place the magnet on the valve stem of the LF tire pressure sensor. The horn will sound briefly to indicate that the tire pressure sensor has been recognized by the TPMS module. 7.Within two minutes after the horn sounds, place the magnet on the valve stem of the RF tire pressure sensor. NOTE: If the VSM (TPMS module integral to VSM) does not recognize any one of the four tire pressure sensors during the tire training procedure, the horn will sound twice and the message center (if equipped) will display "TIRE NOT TRAINED REPEAT" and the procedure must be repeated. 8.Repeat Step 7 for the RR and LR tires. When the tire training procedure is complete, the horn will sound once and the message center (if equipped) will display "TIRE TRAINING MODE COMPLETE".
ANSWER by DaveJM , January 09, 2011
The sensor will reset automatically while driving, if air pressure is correct. Make sure you check all tires including the spare. If a problem still remains, you will need to have the sensors checked.