2002-2005 Range Rover MkIII / L322
So here I am again with another automatic transmission error. I have a 2004 L322 4.4 petrol which has started throwing up an intermitent Trans Failsafe Error which also leaves a P0720 (Output Speed Sensor Circuit) fault code. Here is what has been happening. The problem does not always happen and I can go a couple of days with no errors while doing the same trip to and from work. When I do get the error there is a 'Bong' along with the trans failsafe error message on the dash but nothing happens to the gearbox and I am able to drive normally, around 10 secs later another 'Bong' and trans failsafe error message but still no change in the car then a third 'Bong' and trans failsafe error message another 10 secs later but this time the car goes into limp home mode and stays in 4th gear. I can clear the fault code successfully while still driving but the car remains in limp mode. If i turn the engine of for a few mins and start up again the fault has gone and the car drives noramlly again with all gears available. This morning I had a slightly different experience, I still got the 'Bong' Trans failsafe errors every 10 secs or so but this time I had a forth 'Bong' and trans failsafe error message but the car carried on driving with no problem all gears available. There were no more bongs and the car continued to drive normally. Also during the initial bongs and messages there are no fault codes it is only when the car goes into limp mode that the error code appears. I know the obvious thing is to change the output speed sensor but I thought I would see if anyone has had the same issue before I do anything.