Driving with a spare tire often triggers the TPMS light. This happens because a spare tire usually lacks a tire pressure sensor. The TPMS then detects no reading and activates a warning light. This alert indicates a possible flat tire, which is crucial for maintaining vehicle safety while driving.
There are two types of TPMS: Direct and Indirect. Direct TPMS uses sensors in each tire, including those on a spare. Indirect TPMS, on the other hand, relies on the vehicle’s anti-lock braking system (ABS) to estimate tire pressure through wheel rotation differences. This means that if the spare tire is used, the system will indicate low pressure unless it has a sensor.
Using a spare tire without a sensor can lead to issues. Drivers may remain unaware of low pressure, increasing the risk of blowouts or reduced control of the vehicle. Furthermore, re-calibrating the TPMS is necessary after replacing a tire. Understanding the functionality and limitations of TPMS is crucial for maintaining vehicle safety. Next, we will explore how to properly use and maintain spare tires to ensure maximum effectiveness during emergencies.
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