Hi mate, if one of the sensors isn't ticking, that's definetely the fault, in my case, I bought all 4 new, buy the BMW E39 ones, which are basically the exact same ones but only differently branded, you can find all 4 new on ebay for 15-20 pounds (I paid 15 for them), installed them, work a treat. You can also paint them which doesn't disturb their functionality
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