Which is the LEAST LIKELY cause for an illuminated tire pressure monitor light?

The illuminated tire pressure monitor light typically indicates that there is an issue with the tire pressure in one or more tires. When analyzing the potential causes of this warning light, having excessive tire pressure in one tire, such as the right rear tire, is the least likely reason for the light to illuminate. Generally, tire pressure monitoring systems (TPMS) are designed to alert drivers about under-inflation specifically, as low tire pressure can significantly impact vehicle safety and performance.

Excessive tire pressure could lead to other issues, but it is not commonly flagged by the TPMS as a cause for the warning light. Conversely, low tire pressure in the left front tire and the spare would directly lead to the activation of the warning light since both conditions indicate that tire pressures are below the safe threshold. Additionally, if there’s a malfunction in a tire pressure sensor, it can also trigger the warning light since it may not be accurately reading the tire pressure levels. Thus, excessive tire pressure does not typically prompt an alert, making it the least likely cause for the illuminated tire pressure monitor light.