P2270 Diagnostic Trouble Code Discussion for January 2026
Heated Oxygen Sensor (Bank 1 Sensor 2) Signal Biased Lean
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| Help Request | Posted | |
| 2017 Subaru Forester 2.0L MIL Lamp on, p2270 P2270: B1S2 sensor stuck lean. ... 02 monitor,EVAP monitor will not set and P2270 shows up but the light has not come on for it I have replaced B1S2 sensor with OEM sensor swapped a known good MAF sensor cleaned MAP sensor.Checked for vac. leaks checked for exhaust leaks and found no v... |
January 28, 2026 | |
| 2017 Subaru Forester 2.0L MIL Lamp on, p2270 P2270: B1S2 sensor stuck lean. ... 02 monitor,EVAP monitor will not set and P2270 shows up but the light has not come on for it I have replaced B1S2 sensor with OEM sensor swapped a known good MAF sensor cleaned MAP sensor.Checked for vac. leaks checked for exhaust leaks and found no v... |
January 29, 2026 |
