TIRE SENSOR KEEP BLINKING NOW AND THEN BUT MY TIRE ARE NOT LOW OR FLAT

Most likely a tire pressure monitor light. Check pressure in your tires. If you fill them up to the correct pressure and the light goes out, probably after driving a bit, the mystery is solved. By the way, the sensor is not part of the tire. If the sensor is bad, the only way to stop the blinking is to replace the sensor that is bad. A bad sensor won't hurt anything. You just won't know if one of the tires is low and you will have to check such yourself.

It seems to me you may need to replace the low pressure sensor located inside the rim.

Sensor from the flat tire or low tire air pressure is located inside the tire air valve on every tires,you need to check the pressure of your tires ,sometimes low pressure will triger the sensor ,if it didn't solve the problem you need to go to tire shop and tell them to replace the battery.

If you mean the TPMS tire pressure monitoring system dashboard light, make sure the tire pressure is set according to the decal on the drives door. If that's ok, have a tire store calibrate your tire sensors. If that doesn't help the sensors themselves need to be replaced. The battery in the sensors have a limited lifespan which is the down side to the system. I had to have mine reset after a tire went flat. If it only leaks a little (normal leakage) it seems to clear if you air it up to spec before it gets too low.

My wish is that the dash told which tire was low and would go red if it got below half it's recommended tire pressure. I freak if it comes on at all since I don't know if it's just a pound low or totally flat! Car manufacturers need to improve this system greatly!

Step 1:

You could have a bad tpms sensor in one of the tires here's how to check it

Step 2:

Reading TPMS codes and clearing them
There is a simple procedure to perform a self diagnostic and clear the codes.

1) Turn IGN switch to ON.
2) Locate the TPMS warning check connector. It is a single loose wire with a connector located under the dash next to the steering column. It may be bundled with the OBDII diagnostic connector.
3) Using a suitable piece of bare wire inserted into the connector (a paperclip will do), momentarily ground the wire to the chassis.

NOTE: If you are uncomfortable doing this, then don't. You could damage your vehicle if the wrong wire is grounded.

Step 3:

4) The TPMS low tire pressure warning light will blink error codes as follows:

5sec. ON - 5sec. OFF
Long (1 sec) blink = First digit (2 blinks = 2)
Short (0.2 sec) blink = Second digit (ie 3 short blinks = 3)

There is a 2 second pause between multiple codes.The cycle will keep repeating starting with 5sec. ON

Codes:

15 - Front LH tire pressure drops to 26 psi or less.
16 - Front RH tire pressure drops to 26 psi or less.
17 - Rear RH tire pressure drops to 26 psi or less.
18 - Rear LH tire pressure drops to 26 psi or less.
21 - Data from front LH transmitter can not be receive.
22 - Data from front RH transmitter can not be receive.
23 - Data from Rear RH transmitter can not be receive.
24 - Data from Rear LH transmitter can not be receive.
31 - Checksum data from front LH transmitter is malfunctioning.
32 - Checksum data from front RH transmitter is malfunctioning.
33 - Checksum data from rear RH transmitter is malfunctioning.
34 - Checksum data from rear RH transmitter is malfunctioning.

5 short blinks - System is OK.

5) To clear the codes, turn the ignition OFF.

The tire pressure monitors I have seen require you to drive a certain distance after correcting the low pressure condition.I believe it uses the wheel speed sensors to detect a tire with low pressure(then one that is low will be essentially be giving a different reading because it is rotating more times at a given speed).I am assuming the system IS sensitive enough to get a false reading if one of the tires is a mismatched size,so keep this in mind.

good question, don't think i have ever been asked this one.the tire pressure is monitored not by a pressure sensor inside the tire on a pathfinder but by the wheel speed, each wheel hub ( the thing the wheel bolts to ) has a speed sensor and the on-board computer is allwise monitoring the wheel speed, if one tire gets low on air it will be slightly smaller in diameter, so this will cause that one hub sensor to allwise read a slightly higher speed than all the other sensors so if the computer keeps seeing one wheel reading a little faster then all the other wheel sensors wile the car is going strate down the road it will them assume that that tire is low on air and turn on the low tire light. now some of your high doller cars do have sensors inside the tires but those cars do not have spair tires ( have you ever seen a spair on a corvett?) and those setups have specal made tires and wheels for this system.....so as you can see the spair is not bolted to a hub so the car doset care if its flat or not, but you will if you ever need it, so ckeck the air in the spair.

Make sure you refill the tires with the specific amount of air and if it doesnt make the light go away you got a bad tire pressure sensor.
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tire monitors pressure is low in a tire they **** if its blinking u have a problem just keep tires inflated to 36psi or sensors wont work if that fails go to dealer low tire pressure

The TPMS is a pain in the you know what. Have you changed tire sizes? There could be a bad sensor and may need replaced. We continually get problems all the time with the TPMS. We have reset then they reset again.