1. Have now had a chance to consult the repair manual. There IS a fuel temperature sensor, and it's a part of the fuel supply pump. There are two ways of checking it's ok - first at the sensor itself (resistance reading), and secondly at the ECU end (another reading). You need to be a decent auto-electrician to tackle these checks. The ONLY reason I have mentioned this is that these items have been known to fail on other vehicles, and they are an obvious check. But so for that matter are other temperature sensors: apart from the fuel temp sensor (THF), there is one for the water (THW) and one for the air intake (THA). Presumably all three affect how the engine will run/start. 2. BUT, you don't need to take on all this detail. If you took the car into the dealer with the complaint "won't start when hot", then it is up to them to diagnose the fault, and fix it. From what you say, replacing the battery and s/motor haven't effected a fix. That being the case, I would go back to them, and let them proceed further, BUT make it clear that your pocket is not bottomless, and that the fault will need to be reliably sorted before you make any further payment to them. Ask that they give you their new diagnosis before repairing, together with the costs involved, so you can authorise. When it is sorted (and they have fitted additional parts A,B,C...), let them know that you will need to run the vehicle for a day or three before signing it off. Do NOT sign off the repair ("untested" or otherwise), but if a signature is required, then add wording something like "Conditional upon satisfactory road testing, between dd:mm:yy and dd:mm:yy" (which must be over several days). If all works out well, before you pay any monies to them, tell them that you are looking for a significant financial gesture over the battery and s/motor, which was, in your opinion, their incorrect diagnosis. If they are difficult, then inform them that you will be seeking an independent inspection from AA/RAC/..., and (if necessary) involving Trading Standards. _______ I say a lot of this from some bitter experience. Toyota Service, for all their merits, do seem to be more than happy to simply replace everything in sight when a fault occurs, in the hope (often fulfilled) that somewhere in all the replacement the fault will be swatted. This isn't always good enough. Chris