P0131 Code- O2 Sensor Circuit Low Voltage Bank 1 Sensor 1

What Does P0131 Mean?

P0131 is telling us there is a fault in the oxygen sensor, located in the bank 1 sensor 1 location of the vehicle. This is also called air/fuel sensor, or heated O2 sensor. This means that the ECU has detected either improper voltage from the oxygen sensor or improper air-fuel ratio.

Bank 1 is referring to the left side of the engine, when sitting in the drivers seat. Sensor 1 is referring to the sensor located before the catalytic converter in the exhaust system.

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What are the common causes of P0131 ?

Possible causes include a faulty oxygen sensor, faulty electrical connector at the oxygen sensor, faulty or shorted wiring in the oxygen sensor circuit, a blown fuse for the oxygen sensor (if applicable), low or excessive fuel pressure, a vacuum leak on the engine, excessive exhaust leaks, or a faulty PCM. PCM failure is rare.

What are the symptoms of P0131 ?

It does one good to note that the HO2S have nothing at all to do with fuel trim and are used only to verify TWC function, though FT problems, such as those caused by fuel pressure or misfiring cylinders, could skew HO2S readings, perhaps even set TWC or HO2S DTCs, but these would not result in circuit DTCs. Most of the time, as the TWC is not critical to engine function, but simply an emissions-control device, you will not notice anything other than the MIL.

How do you troubleshoot P0131 ?

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.



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