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International Automotive Technicians Network
Re: GTC ST05 Oxygen Sensor Tester
Posted to Tool & Equipment Forum on 5/9/2019

I'm surprised more techs don't use this. Dead O2? No signal? Probe the O2 signal circuit as close to the sensor as possible and while holding the test lead probe in one hand (skin contact) touch the batt + with the other hand to see if the pcm responds to the ... Login to read more.