My Toyota Hiace van has the engine management warning light on. It has also gone into 'limp mode' permanently. The code fault has been read as "fuel pressure regulator fault", however I have taken it to three garages and non of them know how to fix it.

I have searched online and can find no information on what this could be. I contacted Toyota but they seemed not to know what it could be which didn't fill me with confidence given their hourly cost.

The warning light comes on from ignition and stays on, the only time it cleared was when I had to replace the batteries where it was okay for a couple of hours driving up the M1 but returned as soon as the ignition was put back on after a stop on the motorway.

Any help would be very gratefully received as I really don't know what to do now.