Tire pressure warning light malfunctioning?

Yes, take it to your dealer and have them repair or replace.

 

Could be a bad sensor or other problem with the tire pressure warning system.

You need to know the error code stored by your vehicle. Also, does your TPMS light blink after 15 minutes of driving, or right after you start your car?

If you want to try to solve this yourself, you may find the code by using a small piece of wire as a jumper. Otherwise, you need a dealer or tire shop with capability to diagnose. For the jumper method, see:

http://www-rohan.sdsu.edu/~nash/TCH/TPMS.pdf

 

First and foremost - do you have any LED modifications? If you do, in your license plate area - this could very well be the problem. Report back.

 

Ok, I know this is going to sound stupid but I went to a local tire shop to fill by tires up to 40psi because I have nitrogen and can't do it myself. They said they won't go above 35psi or it will set the tire sensor off. I think this is bull, but maybe that's your problem.

 

Uninformed BS.

 

When you reset the system it does set the "correct pressure" to whatever is in the tyres. If the pressure in -any tyre- drops more than 20% the light will come on. I'm not sure what happens if the pressure -rises-.

 

There was a member who recommended a way to set the tyre pressure and set the TPMS system so it wouldn't alarm unnecessarily. I believe the high pressure won't cause the light to come on, only a 20% drop from the set value will trigger the light. Note that the "set value" is stored in the TPMS computer which reads it from each sensor and stores the value returned for each sensor S/N. If your car is parked beside another one with the same sensors the system shouldn't get confused because the car comes with each sensor programmed into the TPMS computer or the dealer does that if/when he changes a sensor. This is why that extra step is required. Mazda made the mistake of not recording the sensor S/Ns when they first started using the TPMS system on the RX-8, and on that car, if you were parked next to another, its' sensors could confuse your cars system.

The idea the above referenced posting talked about was how to change the % drop value from -your- desired tyre pressure. By setting the system with different pressure than what you run then repressurizing the tyres to what you run you can change the warning to whatever % drop you like.