Relay 2 is operated by Relay 1, interrupt signal to relay 1 and you cut everything. You'll probably get a CEL when you interrupt the circuit which will kill ecu and FP, but when the circuit is closed it should reactivate with no CEL and nothing stored in the memory. Unless your generation has some queer test routine in the ecu it should work. I do all of my cars this way, even use it for an anti theft.
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