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International Automotive Technicians Network
Re: P0032 AFR/O2 Heater Control Circuit High B1S1
Posted to Technical Discussion Forum on 8/15/2024

All my current waveform captures for S1 AF sensor heaters show 8-10A initial with a solid 100% on time for 5-8 seconds before switching to PWM at around 6A. The duty cycle changes depending on rpm and load, but I have never seen the upstream heater turn off. ... Login to read more.