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I bought a rear O2 sensor by mistake when the code calls for a front one. Can I just snip the wires and change the plug over? They look the same.
No. The front is actually an AF sensor that measures the oxygen content in the exhaust at a faster rate than the rear O2 that monitors CAT performance.

Swap out for the correct sensor.

You never want to "splice" and AF or oxygen sensor.
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