I think I've got the same problem, and I'm glad I found this thread. I've got a 2000-reg R75 2.0 petrol - manual, the European model (LHD). Recently, the parking assistant failed to engage (no beeps) several times - it happened like 1 in 10 times. Later I learned that when it does not engage the reverse lights are not working either. Trouble is that it is getting much more frequent, and while I was reversing into a dark garage today it gave me a headache - I could only use the breaklights to get some light behind me!Manual gearbox? My money is on the switch, forget the fuses.
My question: is this 100% the switch (I'm afraid), or is there anything else to check?
My question #2: under which side wheel would I find it on the LHD model? And please also tell me if it's left (where the driver sits in Europe) or right (passenger's) because this near-side off-side thing is confusing me! (sorry)
And the last question: is it something I would be able to replace, without car fixing experience (i.e. is it similar to changing the dipped-beam light bulb, or is it much harder to do?). Is it still possible to get the replacement switch, or is it possible to fix it somehow?
Thanks for your tips / ideas in advance!