Set your multimeter to Ohms (Ω). Insert probes into the two pins designated for the occupancy sensor (refer to your wiring diagram; typically pins 3 and 4 on connector C3PS01B). A healthy sensor reads between 200Ω and 1.5kΩ depending on pressure. A reading of 0Ω or near-zero = short to ground.
Check the continuity between the engine speed signal input pin and a known bare-metal ground point on the chassis. land rover b1d9f11 2021