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P0031 code on a new sensor


couchiedemon
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Hi. I'd welcome some advice for my 2001 H6 Outback. Not long after I bought it I noticed an intermittent problem with the Check engine light coming on (at same time as VDC Off light being illuminated). A quick check with Torque confirmed the error code as P0031 Bank 1 Sensor 1 which i took to be the offside front Sensor (UK). Deleting the code made it go away for a couple of weeks but on hot starting occasionally back it came. So I replaced the sensor last week and cleared the codes. Everything went well for a couple of days.

 

Today the error code came back. Same error code but the description was slightly different  "HO2S Heater Control circuit low (Bank 1 Sensor 1)"

 

Is this likely on a brand new sensor or could it point to a duff connector or something else duff with wiring between the sensor and the ECU?If the latter how would I go about checking.; Any advice gratefully recd.

 

:wacko:

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  • 2 weeks later...

Success was short lived. The old sensor started playing up but a) not as much as the new sensor and B) only on hot start-ups i.e when the engine was thoroughly up to temperature. I have checked the connector and it looks sound but wonder if there is a further connection upstream between the existing connector and the ECU?

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