EYY
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To connect the plug you can use a piece of wire pushed into the plug to extend it enough so that you can take a reading. No need to drill holes - you can feed it through the firewall grommet (may need to do this with a bit of coat hanger wire). Even just to test it you could connect the wire to the pcm, run it out the window and down to the o2 sensor signal if you wanted to confirm that wiring is the problemdo i run a new wire from the sensor right up and somehow connect it to the PCM? Do i need to drill a hole in the floor to run this wire? I tried the multimeter but couldn't work out how to test the wires, as i can't connect the plug on the 02 and PCM at the same time
If you were able to fit a memcal and do your own diagnostics I’m sure you can sort the wiring too.