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I think the U1000 fault code may be the most important, you will need an advanced level scanner to communicate with the system control units by doing a system call to determine which of the sensors are communicating and which ones are not, this will help to determine which sensors are playing up and help you narrow down your problem. Nissen will have this equipment or a good diagnostic firm, then again it may be wiring/ connector problems, earlier in the year I removed all my sensors and cleaned the connectors and fuses as they were starting to oxidise.