TPMS Lights-up Again

After a week in the airport parking lot, my SC430 alerted me upon return that the tire pressure was low. I checked all the tires the following day and found that the pressure was around 30 psi for all 4 tires. I increased the air pressure up to 33 and the light turned off. Very sensitive. A cold front went thru the area and that probably reduced the tire pressure. All is well.

Just 2 weeks later and the light came on again. Again, cold front came thru over the weekend and the car was sitting outside. I started the car up on a cold Monday morning and, bingo, the light is on. I have not checked the pressure in the tires again, but will take a look later in the week. Just a major design flaw. These TPMS' are not what I expected.

USER ERROR! Actually, the tire pressure was low in one of the tires. It was only a few psi below normal, but did require me to put some air in it. The roller coaster ride continues.

TPMS

Tire pressure monitoring system. That is the most recent issue with my car. After leaving from work, the TPMS warning light on the dash lit up and remained on until I turned the car off. I checked all the tires and they looked fine. I also checked the pressure in each tire and they were all a little low. Read around 29psi where the owners manual states 33psi. I added the air and re-started the car to see if that fixed the warning light. DID NOT. I read the owners manual section on the TPMS and learned about a switch inside the glovebox. This switch allows you to select a MASTER set of sensors and a secondary set of sensor for a second set of wheels equiped with TPMS. I togged it back and forth and returned it to the master setting. I re-started the car again... same light still on.

The next morning, I started the car. NO LIGHT. What a surprise? I expect that either a sensor is about to fail (battery life) or the tire pressure was a little low and the sensor needed time to re-register the new pressure. Either way, the light is off!