2005 - Toyota Prius. This is the situation: despite 3 0r 4 different Toyota Service Departments over the phone diagnosis, I DO NOT HAVE "Low Air Pressure stems on my Tyres" So when this yellow light comes on a week ago I called the Toyota dealership from which I purchased it (5 years ago) and they told me my tyre was flat. I'm British! British people are paranoid about tyre pressures because we get fined for having wrong tyre pressures; wrong tread life; wrong tyres; etc etc etc. My Tyres are 3 years old they did not give out any warning signals prior to last week. So finally I take it into East Coast Toyota who after smirking their way through the induction finally admitted that I do NOT have a tyre pressure problem but that I could have an ECU problem. Is this a fairly inexpensive operation? or am I looking at a remortgage?
So, you don't have tire pressure senders in your rims, but you got a low tire pressure warning light? The dealer says it's your ECU that's throwing a low tire pressure warning light?
I don't think they're giving you correct information. In my 2010 and 2012 Prius, at least, the tire pressure monitoring system works with a transmitter in each tire. If the transmitter is missing, a warning light appears. After inflating or rotating the tires, it's necessary to reset the system by pressing a button beneath the dash when starting the car. Bottom line, though, if your tires are correctly inflated, it doesn't matter what the light says.
All new cars in the U.S. have TPMS by law. However, there is no requirement to replace the pressure sensors when they fail or when you replace the wheels, so an older Prius might be missing the sensors. Without sensors, the TPMS ECU will display the warning light - that's what it's designed to do. Either live with the light or buy some sensors. Tom
