RX Tire Pressure Sensor Fault

I've got a 2005 Lexus RX hybrid with about 102,000 km on it. Lately, I'm getting a 'Tire pressure too low' warning on the dash, along with an error message in the speedometer. I checked the tire pressures manually, and they all seem fine. My OBD reader is showing a sensor fault. I'm guessing it might be a dying sensor battery, but has anyone else run into this?

4 comment(s)

Oh, that sounds annoying! So, the tire pressures are definitely correct when you check them yourself? Like, you've double-checked with a decent gauge? Is it always the same tire that's throwing the error, or does it seem to be random?

Yeah, I've checked them multiple times with a good gauge, and they're all where they should be. And no, it doesn't seem to be the same tire every time. It's kind of random which one triggers the warning. Does that point to anything specific?

Okay, random definitely suggests a sensor issue rather than an actual leak. Given the age of your RX, those sensor batteries are probably getting weak. It's probably not worth messing with yourself. I'd honestly just take it to a workshop and have them replace the sensors. It'll save you a headache in the long run.

Thanks a lot for the advice! I took it to my local shop, and you were spot on. They confirmed it was the sensor batteries. Ended up costing me about 280€ to get all four replaced. Annoying, but at least it's sorted now!

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