Anyone have issues with the o2 sensors? I’ve got a 2019 with 119k miles, threw a p0141 code for the heater circuit core of an o2 sensor, bank 1 sensor 2. Replaced it with an OEM part and it still threw the code, took it off and tested the o2 sensor that was installed - the sensor was good. Replaced the upstream as well and cleared the code. The code still comes up. Checked the wiring harness and ECM, and all seem to be good. Any suggestions?
dishtroll
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983 Posts
While I DON'T have a 2019 FSM, I do have MY14 and MY24. On the 2014, +12 comes thru a relay, then a fuse in the extra fuse strip next to the inside fuse box then to BOTH Oxygen sensor heaters. The ECU controls and sense the ground to turn on the heaters. Extra fuse strip described in this thread: https://www.subaruxvforum.com/threa...com/threads/additional-fuse-block-right-of-interior-fuse-box.72626/#post-960114
MY24 is different. No relay, From the Main Fusebox under the hood, Fuse #17 supplies +12 to both sensors and again the ECU senses and supplies ground.
I would think the 2019 would be no different in that +12v is supplied to the Oxygen sensors and the ECU monitors and controls ground. If anyone has access to a 2019 FSM, they can help with what fuses or if a relay is involved in getting +12 to both sensors.
MY24 is different. No relay, From the Main Fusebox under the hood, Fuse #17 supplies +12 to both sensors and again the ECU senses and supplies ground.
I would think the 2019 would be no different in that +12v is supplied to the Oxygen sensors and the ECU monitors and controls ground. If anyone has access to a 2019 FSM, they can help with what fuses or if a relay is involved in getting +12 to both sensors.
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