P1137 SUBARU Possible Causes
- Faulty front A/F oxygen sensor 11
- Front A/F oxygen sensor 11 harness is open or shorted
- Poor electrical connection in the front A/F oxygen sensor 11 circuit
- Faulty Engine Control Module (ECM)
How to Fix P1137 SUBARU Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Check Engine Light On (or Service Engine Soon Warning Light)
P1137 SUBARU Meaning
The sensor contains a pump cell and a reference cell separated by a porous diffusion gap. The purpose of the pump cell is to allow oxygen ions to enter or exit the reference cell based on demand. The reference cell must be maintained at a lambda value of 1.
The Engine Control Module (ECM) supplies current to the pump cell so that the sensor output voltage from the reference remains constant.
When the reference cell is lean, a positive current is used to pump oxygen out of the cell.
When the reference cell is rich, a negative current is used to pump oxygen into the cell.
When the reference cell is at lambda 1, no current is applied to the pump cell. The amount of current supplied is proportional to the amount of oxygen in the exhaust gases. The ECM uses the amount of current as a signal. The ECM uses the signal to calculate the actual air/fuel ratio. The fuel injection duration is adjusted accordingly.
The sensor only functions properly when it reaches a certain temperature. The heating element quickly brings the sensor to operating temperature.