annapeters1
Sienna tire pressure warning light
Summary of the thread
The tire pressure warning light on a 2020 Toyota Sienna hybrid was persistently indicating low tire pressure despite manual checks confirming proper inflation. This issue was likely due to a faulty Tire Pressure Monitoring System (TPMS) sensor, possibly caused by a dead sensor battery. The recommended solution was to consult a workshop for diagnosis and replacement of the faulty sensor, which resolved the problem.
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4 comment(s)
annapeters1 (community.author)
That's what I was afraid of! I'm not sure how old the sensors actually are. I bought the Sienna used with 50,000km on it. Is there any way to check the sensor battery without taking the tire off, or am I stuck going to a shop?
lenadrache1
Unfortunately, there's no reliable way to test the sensor battery externally. Given the symptoms and mileage, it's highly likely that one or more sensor batteries are nearing the end of their life. I would recommend consulting a workshop. They can diagnose the issue and replace the faulty sensor.
annapeters1 (community.author)
Okay, thanks for the advice! I took it to the shop, and you were spot on – it was a dead sensor battery. Replaced the faulty sensor, and the error is gone. Cost me around 280€, but at least the annoying light is gone! Thanks again for pointing me in the right direction.
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TOYOTA
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SIENNA
lenadrache1
It certainly sounds like a TPMS (Tire Pressure Monitoring System) issue. Since you've confirmed the tire pressures are correct manually, a failing sensor is the most probable cause. How old are the sensors? Has the battery of the sensor been replaced?