Wow I wouldn't say much but wow times have changed. I'm an old school mechanic. and using a simple light tester I figured that was all I needed. I was wrong. With this power sensor I can easily test many more sensors. I can test the e-vap sensors, both vent and purge. With this one-step tool I can check whether the (-) and/or (+) connector is defective. Yesterday I had to check the wheel speed sensor. as soon as I checked the ground at the connector. I know the ground wire was broken, I traced that wire and it led me to an open wire. saved the cost of wheel speed sensor "$65"
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