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I drive a 2010 Mazda 3. My tire pressure light is on, I have had my 5000mile service done they checked the tires for leaks nothing! When I pulled away it did go off, but that day I was driving to San Diego from Phoenix and sure enough half way there it came back on. This was about a month ago an it's still on. I don't understand what the deal is? Any ideas? Thanks!

Answers from the Automotive Experts

Breanne Boyle, Contributing Editor at It could be a slow leak or a weak spot in the tire that is causing the pressure light to come on. I would take it back into the dealership, especially because it is so new (and probably still under warranty) and ask them to solve the issue. They can run a scan to get a trouble code to find out the issue for you.

Colleen McGee, Driving Instructor at Americas Driving School It sounds like something may be wrong with the sensor for the tire pressure light. If you have checked the tire pressure, and the tires are at the CAR MANUFACTURERS suggested tire pressure (usually found on drivers door panel), you have no need to worry about over inflated or under inflated tires. If the tires are inflated to the TIRE manufacturers suggested pressure, it is likely higher than what it should be for your car. Otherwise check to see if there is an electrical problem with the sensor for the tire pressure light. Hope this helps! Colleen

Georgia Brown, Director of Education at National Independent Automobile Dealers Association (NIADA) The sensor for the tire pressure is super sensitive and even a change in the outside temperature can affect the pressure in your tires. We drive a Honda Civic and the first time we had a "Blue Norther", that light came on and stayed on until we added air to ALL the tires. Be sure you check with an air gauge and that they are all at the recommended pressure. Georgia Brown

Amanda J. Pierce, MBA Emily, Your tires have an internal sensor inside your valve stem components that send a signal to the main computer. Your tire pressure gauge comes on within just a few pounds off. If you have a full size spare ,that too, has a tire pressure sensor gauge. You may need to just air the spare up a few pounds to have the light go off.

Audra Fordin, Owner at Great Bear Auto Shop Hello Emily, Sure, I have an great idea! Stick with your instinct. If you think there is a leak in a tire and your tire pressure is low and your car says your pressure is low... I would have to agree with you. You have a leak. When checking for leaks, the wheel itself and valve stems can be a tricky leak to spot. Mechanically yours, Audra

Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube It may be a bad sensor. Take it back to Mazda and it should be covered under warranty.

Kathryn van der Pol, Owner/Manager at Adolf Hoepfl & Son Garage My guess is you either have a slow leak or a faulty sensor. Proper tire pressure is determined by the manufacturer of the vehicle, not the tire maker. If you look inside your car door or on the wall where the driver's door closes, there is a sticker that tells you what the proper tire pressure is for your vehicle. Check your tire pressure and make sure it is correct. Either under inflated or over inflated tires will set off the warning light. If the tire pressure is correct, you may have a broken sensor. If you had your tires rotated, it is possible that the sensor was broken. These sensors look like normal valve stems and are easily damaged--unfortunately. Technicians should be careful and pay attention when they rotate the tires. Also, another possibility is that if the tires were rotated, the sensors have to be reprogrammed. The tpm sensor is linked to a position (e.g. front pass, rear pass, etc). If you change the position of the tire, you have to tell the computer. This is done with a special programming equipment. I know it is frustrating that something as simple as tire pressure triggers a warning light. Our thoughtful government wants us to maintain properly inflated tires because it improves gas mileage by 10 percent and creates a more road worthy safe vehicle. You are driving in areas that experience dramatic changes in temperature. This also has an effect on tire pressure. I hope it's something simple.

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Emily, It's possible the sensor for that wheel is bad. Have a technician test it. Lori Johnson

Pat Fleischmann, Director of First Impressions at Community Tire Pros & Auto Repair It’s hard to say without first hand and looking at the issue... First thing to check is what the pressures are set at~ At this time, we also check the spare tire. On some vehicles the spare tire has a sensor as well, and it may not have been checked. There is a possibility of an issue within the tire pressure monitor system, such as a sensor failure. However, it’s usually a pressure setting issue. Good luck and please get it looked at, could be a simple issue. The holidays are too busy to be stuck on the side of the road...

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