Do you have access to OBD live data? I would start by checking the live data on that O2 sensor and then add some external fuel to check if the O2 sensor picks up the engine getting more fuel. If it does, then I would check for vacuum leaks or some hose connection on the intake pipe which may be loose after the air filter replacement. If the O2 sensor doesn’t detect then it is likely a bad O2 sensor.
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