To replace a universal one-wire oxygen sensor with your 1997 Ford Aspire's four-wire setup, first locate the existing sensor and disconnect it from the wiring harness. The four wires typically include two for the heater (usually a pair of the same color), one for the signal (usually a gray or black wire), and one for the ground (often a white wire). Connect the signal wire from the universal sensor to the corresponding signal wire on your vehicle, and connect the heater wires to a power source and ground as per the universal sensor's instructions. Finally, ensure all connections are secure, and reassemble everything.
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