We have an 04 GX-470. Most of the time the fuel gauge and the range readout work OK. However, sometimes, the fuel gauge works, but the range shows 0 miles, or they both don't work - fuel gauge shows empty and range = 0. My wife says she thinks she's seen the gauge = empty but the range still showing xxx miles - I haven't seen that.
We've been to 2 different Lexus dealers, paid for diagnostics at both and gotten no fix. In fact, they have both said they can't find anything wrong. But thanks for your money......
To my way of thinking, these would both get their initial information from the same source - some sort of sender unit on the fuel tank. However, as both gauges do not always go out together, I'm inclined to think that this probably isn't the cause. I would think that the range readout comes from some calculations done by the onboard computer.
Anyone else experienced this? Is VERY frustrating as we regularly drive from Phoenix to Sacramento.