Mazda 6 tire pressure light keeps coming on

Q: Why is my tire pressure light on when my tires are fine?

If you notice the tire pressure light come on, its probable that one or more of your tires has low air pressure. You should not rely solely on the reading from the vehicles tire pressure monitoring system though; there are numerous factors that can cause the sensors to go off even if your tires are in good shape.

Q: Why is my tire pressure light still on after filling tires Mazda?

If youve added air but the air pressure warning light stays on, theres a problem with your Tire Pressure Monitoring System or you have a slow leak. Assuming there is no leak in your tire, a lit TPMS warning light indicates a problem with a tire pressure sensor.

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Why is my tire pressure light on when my tires are fine?
Why is my tire pressure light still on after filling tires Mazda?
Why does my tire pressure light keep coming on and off?

Maintaining proper tire pressure levels is a key part of regular vehicle maintenance.

Proper tire inflation is a part of vehicle maintenance often overlooked by vehicle owners. Ensuring that your tires are filled to the proper levels is significant, however, and can keep you safe on the road while extending the longevity of your tires. To make sure the tire pressure monitoring system in your Mazda vehicle is reading the tires PSI correctly, you may wonder, how does the Mazda tire pressure sensor work?

The monitoring system works to detect low tire pressure in any of the vehicle’s tires. If this should happen, the system will alert you to this fact by displaying a lit icon in the instrument cluster. If this happens, it is important to check your vehicle’s tire pressure right away and ensure they are inflated to the proper levels, or you can schedule a service appointment online with Mazda of Lodi technicians.

Whenever you adjust the tire pressure in any of your vehicle’s tires, it is necessary to set the tire pressure monitoring system so that your vehicle knows what is considered a normal pressure level. This action should also take place after a tire rotation, tire replacement, or when the vehicle’s battery dies or is replaced.

Setting the tire pressure sensor is easy. Simply park the vehicle with the parking brake on. Make sure the tires have had time to cool down, and then adjust the tire pressure to the necessary level on each tire. Once the tires have been inflated, switch the ignition on and hold down the tire pressure sensor “SET” button until the tire pressure warning light flashes twice and a beep is heard.

Answering your Mazda questions such as, how does the Mazda tire pressure sensor work, is what we do here at Mazda of Lodi, so stay tuned to the Mazda of Lodi blog for more helpful information. Also see our tips for determining when to get new tires. Now that you know how to use the tire pressure monitoring system, you can have peace of mind on the road. For other maintenance concerns, feel free to contact us.

So here's the story and some lessons learned.

As reported earlier, subject car is a 2009 Mazda 6 Sport. Vehicle came in with TPMS light on. No further details.

Tire pressures were set and a relearn was attempted. It was discovered that the relearn procedure is automatic, so I read the sensors with my tool. All the sensors were very slow to respond except the RF. Slow response usually means a weak sensor. I initiated and performed a relearn but the light stayed on.

I checked for codes in the TPMS module and got a C2014 for wheel unit 4 communication. Mazda does not locate the sensors, but rather designates them by wheel unit. To identify which wheel is unit 4, Mazda says to set the pressures of the wheels at specific levels, drive the car and match the wheel units with the corresponding level. I did this and wheel unit 4 matched the LF sensor.

Knowing that there were 2 more sensors testing weakly, we sold 3 sensors. We used Dorman direct fit sensors on 3 corners, all except RF. Another relearn and now I had codes not only for wheel unit 4, but now for all the sensors.

I scanned the hex id's of the sensors and compared them to what the TPMS module had. They did not match. I was beginning to think I may have incorrectly identified wheel unit 4 as the LF, and it was actually the RF. I found paperwork in the car from the dealer who replaced the RF sensor back in May. This was, in my mind, the least likely sensor to have failed. Despite this, I replaced the RF sensor and I was able to relearn the sensors.

Lesson number 1: Do not use the pressure method Mazda states to identify wheel units. Scan the hex id's and match them with scanner data. I feel this to be much more reliable.

Lesson number 2: Mazda will not learn new sensors at all if just one sensor is not right. So conceivably if you replace 4 sensors and one is defective, you'll get failure codes for all 4 and you won't know which one is defective.

Lesson number 3: Even if a Mazda sensor can be read, it could still be defective.

Lesson number 4: Mazda's suck.

That was a lot of effort for a simple TPMS light. I hope this helps someone in the future. I'd hate to think I got my butt handed to me for nothing.

Have a 2014 3 and the same issue happens for me sometimes, especially when I swap out snow and summer tires. Eventually it settles down.

More importantly, one issue that can cause this is one wheel getting hotter than the others because of a common Mazda problem: a seized or collapsed brake caliper (usually in the rear). Happened to me. Apparently it isn’t uncommon on the gen 3 3/6 models. The brake sticks and the rotor gets red hot. That temperature reading throws off the TPMS sensor. Of course you have to fix that immediately as it is unsafe. The heat can cause a tire to blow out and your brake can fail. But if it’s just started to seize it might be subtle still. Listen for a popping sound after a longer drive — the brake rotor cooling down more in one corner than the others. Or just put your hand near (NOT ON!) each wheel to feel if one rotor is giving off more heat. A rotor that is overheated will glow red and turn blue/black over time.

May not be your issue but this happened to me. My first warning was random TPMS lights.

Why is my tire pressure light on when my tires are fine?

If you notice the tire pressure light come on, it's probable that one or more of your tires has low air pressure. You should not rely solely on the reading from the vehicle's tire pressure monitoring system though; there are numerous factors that can cause the sensors to go off even if your tires are in good shape.

Why is my tire pressure light still on after filling tires Mazda?

If you've added air but the air pressure warning light stays on, there's a problem with your Tire Pressure Monitoring System or you have a slow leak. Assuming there is no leak in your tire, a lit TPMS warning light indicates a problem with a tire pressure sensor.

Why does my tire pressure light keep coming on and off?

When your tire pressure monitoring system (TPMS) warning light comes on, flashes repeatedly, and then turns off, this indicates a malfunction with the vehicle's TPMS system. If the TPMS comes on and stays on, it means your tire has a dangerously low level of air pressure.