P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I) Trouble Code

P0131 Oxygen Sensor Circuit Low Voltage (B1S1)

Technical Description

Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)

What does that mean?

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.

Essentially the same as P0136 and P0137, a P0131 code refers to the first oxygen sensor on Bank 1.

 

P0131 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 1 is located in front of the catalytic converter.

Symptoms

There may be no visible symptoms to the driver, other than the MIL (Check Engine / Service Engine Soon) illumination.

Causes

A code P0131 may mean that one or more of the following has happened:

Faulty o2 oxygen sensor Short to voltage on O2 signal circuit High resistance or open on O2 signal circuit

Possible Solutions

Replace faulty sensor Repair short, open, or high resistance on o2 signal circuit

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