New TPI units? Frequency? "Learned"

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08 yota Rav4, low tire pressure light is on. Has been since I bought it.
I suspect the wheels are not original, although they are correct for the vehicle.

I see new sensors on Amazon for between $70-$100 each.
If I bought them, can any tire place install them like a new valve stem or is there a special procedure?
I don't have a code reader but I might be able to borrow one if needed.
 
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Make sure you check the spare,it has a sensor also. I have an 07 Rav and have had to replace all 5 of mine (spare also). They need to be programmed. Cost about $100 a pop installed and programmed.
 
08 yota Rav4, low tire pressure light is on. Has been since I bought it.
I suspect the wheels are not original, although they are correct for the vehicle.

I see new sensors on Amazon for between $70-$100 each.
If I bought them, can any tire place install them like a new valve stem or is there a special procedure?
I don't have a code reader but I might be able to borrow one if needed.

Try this first and don't forget to check the spare.



If it will not go away then they might need new sensors. Most of the time if they blink the battery in the TPMS are dead or they lost their programing. If it comes on and stays constant one of the tires is low.
 
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  1. INSTALL TIRE PRESSURE WARNING VALVE SUB-ASSEMBLY


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(a) Insert the tire pressure warning valve into the valve installation hole. Insert it from the inside of the rim so that the print surface can be seen.
  • Check that there is no visible deformation, damage or other abnormalities on the transmitter.
  • Check that there is no foreign matter on the inner grommet and around the rim hole.
  • If the tire pressure warning valve is installed in the reverse direction, it may be damaged or fail to transmit signals when the vehicle is driven at high speeds.
(b) Install the washer on the tire pressure warning valve from the rim side and tighten it with the nut.
Torque: 4.0 Nm (41 kgf-cm, 35 in-lbf)
NOTICE:

  • Make sure that there is no foreign matter on the washer and nut.
  • If the tire and tire pressure warning valve have been removed, check that there is no damage or cuts visible, and no foreign matter, such as mud, dirt or sand attached to the grommet. Replace the grommet with a new one if any of the defects mentioned above are found.
  • Make sure that there is no oil, water or lubricant around the rim hole, tire pressure warning valve, washer and nut. Failing to do so may result in improper installation.
(c) After the tire is inflated, the valve nut may be loose. Retighten the nut to the specified torque and then check for air leaks with soapy water.
Torque: 4.0 Nm (41 kgf-cm, 35 in-lbf)


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(d) Set the wheel disc to the mounting machine and install the lower tire bead. Position the main body of the valve sensor in the shaded area shown in the illustration.

NOTE: If the valve sensor is positioned outside this area, it will interfere with the tire bead and may be damaged.
(e) Install the upper bead.

NOTICE:
  • Make sure that the tire bead and tool do not interfere with the main body of the sensor and that the sensor is not clamped by the bead.
  • Check that there is no water or other liquid around the tire pressure warning valve.
  1. INSTALL FRONT TIRE
Torque: 103 Nm (1,050 kgf-cm, 76 ft-lbf)

  1. INSTALL REAR TIRE
Torque: 103 Nm (1,050 kgf-cm, 76 ft-lbf)

  1. REGISTER TRANSMITTER ID HINT: If the tire pressure warning ECU is replaced with a new one or with an ECU from another vehicle, register the transmitter ID codes.
  2. INSPECT TIRE PRESSURE WARNING SYSTEM
 
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