Sensitive Tire Nanny - 2015 BMW M235i Convertible Long-Term Road Test

Edmunds.com

Sensitive Tire Nanny - 2015 BMW M235i Convertible Long-Term Road Test

The tire-pressure monitoring system in our 2015 BMW M235i is fairly sensitive, throwing us a nervous warning when it dropped just a couple of pounds of pressure below its normal spec.

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socal_eric

Just to make sure, this picture was taken parked with the parking brake on, correct? I'd be a lot more worried if the tire pressure monitoring system turned on the "BRAKE" light as shown above. Even if that's the case, the low tire, stop carefully warning isn't very reassuring. It would be much better if the tire pressure monitoring system (TPMS) indicated comes on if the system would automatically show the actual tire pressure screen on the main display rather than having to dive into menus or at least show the tire and pressure reading of the offending tire on the main instrument panel (e.g. Left, front tire low: 30 psi).

thecardoc3

Are the specs 32/38 ? Does the system auto learn wheel positions or does it have to be trained when someone services the vehicle? A tire at 30psi would not illuminate the MIL if it was supposed to be on the axle that calls for 32psi, but it would light the MIL if it was supposed to be at 38psi. As far as wildly different readings go, that's normal. Heat from the sun, braking, cornering, etc. will cause the pressures to change at a rate of approx. 1psi/10f. That's why you have to factor in just what "cold" is when setting the tire pressures.