I've heard that can happen if you replace the bulb with one that has either
too high or two low a resistance. The sensor assumes the out of range
resistance implies a faulty bulb, when in fact it doesn't.
Could be. Or could be the socket or a connector. It doesn't take a lot
of resistance to trigger the thing.
I don't know what it's line on the E39, but on the older cars it's a box
with reed relays in it, and the reed relays go bad and the solder joints
get cold too.
"C'est un Nagra. C'est suisse, et tres, tres precis."
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