Technical Description

Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

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, P0137 refers to the second oxygen sensor on Bank 1. P0137 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 2 is located to the rear of the catalytic converter and should produce an output signal relative to oxygen storage capacity of the catalytic converter. This rear (sensor 2) sensor is less active than the signal produced by the front sensor. However, if the ECM senses the sensor is inactive, this code will set.

Symptoms

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

Causes

A code P0137 may mean that one or more of the following has happened:

Faulty o2 sensor Exhaust leak near the rear sensor

Plugged catalyst

Short to voltage on O2 signal circuit

High resistance or open on O2 signal circuit

Engine running very rich or lean

Engine misfire condition

Fuel pressure very high or low – fuel pump or pressure regulator

Possible Solutions

Replace faulty sensor

Repair exhaust leak near the rear sensor

Check for restriction in catalyst and replace as necessary

Repair short, open, or high resistance on o2 signal circuit