Tire pressure light, and Anbient sensor it working.

My tire pressure light is on and my tire pressure is fine. I tried resetting the system for it and it isn't shutting off. My ambient sensor, (which I had replaced 1 year ago), will stop working on and off consistantly. Not sure if this is a bad fuse, or bad sensors, or what. Please help!

My car has 159000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi There,
As you know, your car has sensors at each of the four wheels that monitor the tire pressure at each tire. When these tire pressure sensors fail, you may notice inaccurate readings as to your tire pressure. In some cases, you may not receive any kind of indication. It also sounds like your ambient temperature sensor is not working properly, which can be somewhat common resulting in the AC not properly cooling the vehicle’s cabin. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Low battery power and age-related wear and tear can cause the TPMS sensor to malfunction and cause the low tire pressure light but tires are a fine issue.
Tyre Monitoring Indicator

It works via the ABS wheel-speed sensors. They sense when tyre pressure drops, because the wheel roll is reduced and it turns more quickly at the same car speed.

After starting a vehicle, a TPMS icon will turn on for a few seconds; however, if it stays on, it indicates that one or more of the tires on the vehicle are at least 25% below the recommended pressure. If the light flashes for approximately one to two minutes, it indicates there is a malfunction in the TPMS system.
The causes can be a malfunction, or the weather changes. Other reasons why your TPMS light may still be blinking is because your tire may be damaged, or you might have gotten a recent tire replacement. Overall, the reasons can be vast, which is why it is best to take your car to a technician for professional diagnosis.
If your tire pressure light stays on even after filling your tires, it could be due to a faulty TPMS sensor, a low battery in the sensor, a slow leak, or temperature changes.
Unexpected weather changes will often see this situation in the sensor. Specifically, the sudden change in temperature from the desirable area to the cold area causes the sensor cannot adapt in time. It is the reason the widget sounds an alarm even though the condition in the tire is stable.
The pressure reading from a sensor can be easily verified by checking the actual pressure in the tire with a gauge. If the pressure value displayed on your TPMS tool reads a certain inflation pressure (psi or bar), you should find that same inflation pressure when you check with a gauge.
After the TREAD Act was mandated in 2007, all vehicles manufactured in the United States beginning in 2008, must be installed with direct or indirect TPMS systems.
Tire Pressure Monitoring Sensor – Repair or Replace

If your TPMS sensor has failed or its battery has died, the tire pressure monitoring system warning light will come on. To have your Volkswagen Jetta expertly repaired, count on the experts at your Volkswagen service department to perform necessary repairs.

After inflating all four tires to the recommended tire pressure, press and hold the TPMS reset for at least two seconds; you should hear an audible chime, and the TPMS warning light should shut off.

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Tire pressure light, and Anbient sensor it working.
ANSWER : Hi There,
As you know, your car has sensors at each of the four wheels that monitor the tire pressure at each tire. When these tire pressure sensors fail, you may notice inaccurate readings as to your tire pressure. In some cases, you may not receive any kind of indication. It also sounds like your ambient temperature sensor is not working properly, which can be somewhat common resulting in the AC not properly cooling the vehicle’s cabin. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

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