"Tire Defect" sensor - BMW M5 Forum and M6 Forums
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post #1 of 17 Old 14th January 2012, 02:16 PM Thread Starter
JimBeemer
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"Tire Defect" sensor

My "tire defect" light comes on every time I drive. I checked my tires and they all have 38 psi. They are the same PS2s I've had on the last 8000 miles. This just started a week ago. Is there anyway to tell which sensor is bad (Peake Reader? or is that engine only) or perhaps look for a loose wire going into it? Are the sensors easy to get to?

Jim
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post #2 of 17 Old 14th January 2012, 02:28 PM
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post #3 of 17 Old 14th January 2012, 03:27 PM Thread Starter
JimBeemer
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Yes, I've reset it twice using the instructions in the owners manual to no avail.

Jim
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post #4 of 17 Old 14th January 2012, 05:53 PM
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Maybe check the torque on the wheel bolts?

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post #5 of 17 Old 14th January 2012, 11:51 PM
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Just as a reminder, Jim, and to everyone reading, the TPMS on our cars uses wheel speed sensors (also used by the ABS and DSC system) to detect a low tire not actual wheel mounted pressure sensors. There is a way to view the wheel speed sensor data . . .

-J
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post #6 of 17 Old 15th January 2012, 02:20 PM Thread Starter
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Took my M5 to a local Dobbs Tire Center (against my better judgment) and they found a half golf ball sized bulge on the inside sidewall facing the undercarriage of the right rear tire. They contacted Michelin and they wanted the tire to analyze it. It had 8356 miles on it with no track use, but may have been the victim of a pothole, however the wheel itself was straight and true with no damage. They tracked down two PS2s for me and I got two new rears for $310 installed with Michelin covering the rest. Michelin has made me a customer for life with their goodwill! That "tire defect" light really does work as it's supposed to. The mechanic felt I should get an ABS or traction control (DSC) light if one of the sensors failed. He also thought that with the use of what he called BMWs "rolling sensors" the bulge could have distorted the tire at speed and slightly changed the circumference of the tire under different speed and road conditions.

Jim

Last edited by JimBeemer; 15th January 2012 at 02:32 PM.
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post #7 of 17 Old 15th January 2012, 02:45 PM
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Quote:
Originally Posted by JimBeemer View Post
Took my M5 to a local Dobbs Tire Center (against my better judgment) and they found a half golf ball sized bulge on the inside sidewall facing the undercarriage of the right rear tire. They contacted Michelin and they wanted the tire to analyze it. It had 8356 miles on it with no track use, but may have been the victim of a pothole, however the wheel itself was straight and true with no damage. They tracked down two PS2s for me and I got two new rears for $310 installed with Michelin covering the rest. Michelin has made me a customer for life with their goodwill! That "tire defect" light really does work as it's supposed to. The mechanic felt I should get an ABS or traction control (DSC) light if one of the sensors failed. He also thought that with the use of what he called BMWs "rolling sensors" the bulge could have distorted the tire at speed and slightly changed the circumference of the tire under different speed and road conditions.
Great to hear you got it sorted! Also good to hear you got some good customer service.
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post #8 of 17 Old 15th January 2012, 08:47 PM
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The tire defect system works well. I think Mine is stuck in learn all of the time but that does not make a difference. I had a broken belt that I never even felt it was so insignificant. The system kept telling me I had a fault. I just happened to notice the small wear spot when I switched to winters. No fault since the winters went on. New summers for next year were on the list anyway. I thought it was the unit acting up.

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post #9 of 17 Old 16th January 2012, 03:26 PM
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Exact same fault I was receiving with the summers. I have dunlops on the front and michelins on the rear or vice versa. With the winter tires on there are zero codes for the tires"
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post #10 of 17 Old 28th December 2012, 09:34 PM
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A lot of threads on this subject. I chose the most recent post to bring this up. Does a 10lb swing flip the "tire defect" light? I keep my tires inflated at 42lb (f) and 46lb (r). Tire defect lit up after a 3 mile drive. My car has sat for the last 5 days. Weather temps dropped by 40 degrees down here while the car sat. 32/32 (f) and 33/31 (r). I checked for screws and nails and found nothing.
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