Grrrrrr said:

That could be worth a try. Press the inhibit switch when it goes to the wrong height, then press the desired height and when all stable switch the inhibit switch back off. Should stay there.

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pmallinson said:

Thanks again this is something to try and see if it will at least stop it going to extened and locking up, however NOt the final answer / fix to get it working as it should

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Press the inhibit switch, drop it to motorway height and leave the inhibit switch pressed. I run mine like that all the time otherwise the car is up and down like a fiddlers elbow on my run into town achieving nothing but extra pump wear.