My quad, a 500cc hydrostatiic model, since new has had a problem. Every now and again (30 hrs -50hrs)it goes into limp mode. No ES gears at all, reverses only just( better pushing the bloody thing) The gear position light flashes, fault code 10. Normally the angle sensor gets changed and this cures the problem. The last time it went I was told to run the quad in the ES box and not the automatic box. Not made a difference. Are we missing something? What else can we have checked?