04 won't start - red car on MFD

Just have someone see if the brake lights come on when you press with normal pressure. The switch might just need some adjustment.

 

Yes, any DTC logged by the engine and hybrid vehicle ECUs would be lost.

In the meantime, I second the advice that you check when the brake lights come on. Position the car so that you can see the brake lights in your rear view mirror, then see how hard you have to depress the brake pedal to get the lights to come on.

 

The switch position is adjustable. However if you find that the switch operates intermittently, then it should be replaced.

 

There is a little discussed, Toyota diagnostic that consists of an OBD connector and two switched:
http://priuschat.com/forums/generation-1-prius-discussion/79877-intro-dtc.html#post1116332

It can flash the last two digits of the error codes on the instrument warning lights. Using these two-digit codes, you can look up in the maintenance manual and/or ask online to see if they match known error codes.

Bob Wilson

 

I had a similar proble,m the dealer told mw it as a defective inverter pump. That was replaced todday and all is well. So far so good 61+K miles, 04 silver.