Tire pressure warning when too high? - Mazda CX3 Forum
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Old 06-01-2016, 04:08 PM Thread Starter
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Tire pressure warning when too high?

My warning light came on and it started beeping.
I checked my pressure with 3 gauges and they all said all 4 tires were at 40psi.

The manual does not say it can come on for too high a pressure. I suppose it could have been set wrong in the first place.

Any thoughts?
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Old 06-01-2016, 04:22 PM
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It may have been set wrong initially. Based on my experience it should only activate when it is too low.

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Old 06-01-2016, 04:25 PM
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40 is definitely not too high (despite what dealers will tell you).

I would just reset it when cold. Make sure to press and hold the TPMS button for several seconds until you see the dashboard TPMS light blink.
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Old 06-01-2016, 04:36 PM Thread Starter
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Okay, I will try resetting it and see what happens.

Interesting that you don't think 40psi is too high; thing on door says 36/33. What do you recommend, and why?

-----
I reset the TPMS and it seems fine for 20 miles anyhow. I am tempted to deflate a tire and see if it trips properly.

Last edited by Toller; 06-01-2016 at 09:12 PM.
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Old 06-01-2016, 05:19 PM
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36/33 is for cold weather which is what I set mine to in the winter. The other day I checked the pressure when the temperature was about 90 and they were at around 40/37.

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Old 06-01-2016, 06:19 PM
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According to the European Owners Manual, there is quite a difference in the recommended tyre pressures on both petrol and diesel models between upto 3 persons and a full load - especially for the rear tyres. Also rear pressures should be set 0.2 bar, 3psi, higher for AWD as opposed to FWD cars on standard tyres. Winter tyres have a slightly higher difference.

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Old 06-01-2016, 09:23 PM
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Originally Posted by Toller View Post
Interesting that you don't think 40psi is too high; thing on door says 36/33. What do you recommend, and why?
I run 36/33 in the summer and 40/37 in the winter. At 36psi cold, running pressure will likely reach 40-42psi.

36/33 cold in summer gives a nice ride... 40psi cold is a bit harsh for my preference.

40/36 in winter because of the following:

* I want increased hydroplanning resistance (particularly on Seattle's wet, rutted freeways)
* Hot operating pressures won't rise quite as much (~2psi).

Owner's manual actually recommends that you add ~5psi if you use winter tires.
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Old 06-02-2016, 02:22 AM
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Just to chime in there is currently a bulletin out for CX3 tpms lights coming on w/o reason. Its a programming issue that I am told there is suppose to be an update coming soon. My CX3 already experienced this issue and all I did was perform the re calibration method at my dealership using our scan tool. I will keep an update on this as I am told this may affect almost all CX3s and will just require a software update.
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Old 06-02-2016, 02:34 AM
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I have had it happen twice.
The first time I think the condition of the pavement on the road was a contributing factor.
The second time - no apparent reason.
Both times a reset resolved it.

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Old 06-02-2016, 12:51 PM
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You should live on a warm wet island where the temperature remains fairly constant all year round. That's why I spend June in Florida!

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Formerly CX3 SportNav 1.5 diesel automatic and AWD.

All advice is given in good spirit and taken entirely at the readers own risk. WORK SAFELY. 2018 anchorman

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