Question to those who have replaced or rotated their tires

Oh cool! I was just looking at the pic in the manual...kinda looked like it was an "X-Ray" view. Thanks for clearing this up.

Why is it neccesary to do a reset on a tire rotation? You are just moving the front wheel to the back and vice versa, no? There is only one display light for all 4 tires. If one is underinflated, it would light up irregardless of which tire it is. Just a matter of checking.

bmoy88 said:

Why is it neccesary to do a reset on a tire rotation? You are just moving the front wheel to the back and vice versa, no? There is only one display light for all 4 tires. If one is underinflated, it would light up irregardless of which tire it is. Just a matter of checking.

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I asked myself that same question, too. And you're probably right. However, I have seen cars that display each individual tire and show which tire needs more air, so if you move them around that reset button identifies which tire went where. Maybe the warning icon comes on and your display might read "Low Pressure, Front Passenger"?...I don't know; didn't go in depth with the manual. Hopefully, someone will chime in with a technical explanation.

YuDanJa said:

I asked myself that same question, too. And you're probably right. However, I have seen cars that display each individual tire and show which tire needs more air, so if you move them around that reset button identifies which tire went where. Maybe the warning icon comes on and your display might read "Low Pressure, Front Passenger"?...I don't know; didn't go in depth with the manual. Hopefully, someone will chime in with a technical explanation.

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No individual tire displays on the CT200h. When I had my blowout on my mag/tire, I had the spare on the car while the wheel was in the shop and all I had was the "squishy" tire icon showing on my dash.

Each rim has a TPM sensor with a unique ID. The recommended tire pressure front is 33psi and rear is 32 psi.

Presumably the system stores the tire pressure associated with each sensor.

If you rotate tires front to rear diagonally you should adjust the pressures accordingly.

Which means each TPM sensor will now be sensing either a higher or lower pressure than originally stored.

I don't know if the TPM sensors read a 1 psi change but if they do you will need to reset the system.

Also if you run a higher pressure differential front and rear you will definitely need to reset the system.

audi4t said:

Here is a pic of the reset button.

It is adjacent to the led that illuminates the footwell.

You don't remove anything just get your head way under the steering wheel look toward the led and the TPWS reset button is right there.

Once you know where it is you can press it simply from the drivers seat. Just feel under the steering wheel and press.

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I had a slow leak

audi4t said:

Here is a pic of the reset button.

It is adjacent to the led that illuminates the footwell.

You don't remove anything just get your head way under the steering wheel look toward the led and the TPWS reset button is right there.

Once you know where it is you can press it simply from the drivers seat. Just feel under the steering wheel and press.

Click to expand...

I had a slow leak in the left front. After adjusting PSI in all tires the warning light stayed on. Pressed this reset button, let in blink three times and then go steady. Warning light stays on. I have a 2012 Premium. Owners manual does not even tell you how to reset. Tells me to take it to dealer. Yeah, right! Any suggestions?

The tire pressure sensor should be reset whenever anything is done to the tires or suspension...even after adding air to the tires. Although unless a large amount of air was required I do not see any reason to reset if just topping off the air accept if the warning light is activated.