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In this Doctor-IE in the Field, we will show you how to test narrowband planar probes (pre- and post-catalyst). We will demonstrate how to test the probe heater resistance, the probe heater positive supply test, the probe heater negative control test, and the sensor ground test. We will also discuss stoichiometric mixture, rich mixture, and lean mixture. CHAPTERS 0:00 Pre and post-catalyst probe 0:52 Probe heater resistance test 1:29 Probe heater positive power test 4:57 Sensor grounding test 6:59 Stoichiometric mixture 7:55 Rich mixture 8:13 Lean mixture 10:05 Pre-catalyst probe signal measurement 10:31 Signal indicating rich and lean mixture 14:42 Post-catalyst probe signal measurement -- Get to know the Doutor-IE Platform: https://doutorie.com.br/ Take a Test Drive on the Platform: https://doutorie.com.br/test-drive I already know it and want to subscribe: https://doutorie.com.br/assinar/ Doutor-IE Blog: technical information for everyone https://blog.doutorie.com.br Check out our Online Courses: https://doutorie.com.br/cursos-online/ Get to know the Doutor-IE Circuit event: https://circuito.doutorie.com.br/ Be a part of it from our Telegram group: https://doutorie.com.br/grupos Instagram: / doutorie Facebook: / doutorie