O2 sensor inactive
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Joined: Oct 2025
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O2 sensor inactive
my car is sonata 2.4L SE 2017. the o2 upstream sensor is inactive even after I replace a new one. I check the harness. the o2 sensor heater is shorted to one ignition coil and connected to ecu connector 1 pin 42. The harness looks intact and new. It is OEM original. Anyone experienced this problem?
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