Codes p0136, P0141
Although these codes are both for the downstream O2 sensor, they are completely different. The first code, P0136 (https://www.yourmechanic.com/article/p0136-obd-ii-trouble-code-o2-sensor-circuit-malfunction-bank-1-sensor-2-by-jay-safford), has to do with actual sensor performance. The second code, P0141 (https://www.yourmechanic.com/article/p0141-obd-ii-trouble-code-o2-sensor-heater-circuit-malfunction-bank-1-sensor-2-by-jay-safford), has to do with the sensor heater circuit performance....