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Honda instructs O2 sensor testing with a digital voltmeter. The problem is, the techs need a test harness or break out box to tap into the ECU. This equipment is in very short supply and is sent to dealerships overnight when requested. I'm certain that's what they're waiting for. It's easy to perform the test without the harness, but Honda worries (rightfully so) that techs using back-probing techniques will either short out the ECU or foul up the wiring harness.

Stu O
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