Part 3 -How to Test the Ford 4, 5 Coil-on-Plug Dec 02, 2011CASE 1: If the multimeter registered 11-12 Volts (or the test light lit up), then the Power Circuit is OK and is delivering voltage next step is to test the Switching Signal Circuit, go to TEST 3. CASE 2: If the multimeter DID NOT register 11-12 Volts (or the test light DID NOT light up), then the power circuit has a problem result eliminates the COP ignition coil as the source of the O2 Sensors is it Upstream or Downstream | 1A Auto O2 Sensors is it Upstream or Downstream. Created on: 2017-05-12 Does your vehicle need an upstream or a downstream oxygen sensor? In this video, the experts at 1A Auto show you how to identify your O2 sensors to find out which part you need.
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