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[syrinx]

I personally think he needs to connect one CPU with 2 front sensors, 2 rear sensors. Run a factory reset and start all over with troubleshooting.
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I bought 2 CPU because I don't want cables inside the car from the front to rear of the cars. It was working few months like this.

How do you do a factory reset? I tried but it doesn't seem to work.

Please remember that at least one sensor is broken:

With front system used with the rear sensors: when connected to the rear sensors, no error message but only one sensor works as parking sensors. But both detect my laser tester.