W reg 406 HDI's didnt have multiplex electrics, it was introduced from 02 on. Phase 2 406 HDI's were a far superior car to the older XUD's. The XUD was the best diesel engine of its era but was thirsty, no low down power, smokey, liked head gaskets and glow plugs. If serviced correctly and used with good quality fuel the 2.0 HDI doesnt fail and will give 100,000's of trouble free miles.
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