AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

P0137 indicates a low voltage condition in the oxygen sensor circuit for Bank 1 Sensor 2, typically downstream of the catalytic converter, often due to sensor, wiring, exhaust leak, or related circuit faults

Common Symptoms

Check Engine Light illuminated
Reduced fuel efficiency
Unstable or rough idle
Increased emissions output
No noticeable symptoms in some cases

Most Common Causes

Faulty oxygen (O2) sensor Bank 1 Sensor 2 high

Sensor voltage remains low below threshold for extended time

Damaged or corroded wiring/connectors in sensor circuit high

High resistance, open circuit, or shorts can cause low voltage reading

Exhaust leak near Bank 1 Sensor 2 medium

Fresh air entering exhaust dilutes readings

Clogged or failing catalytic converter affecting downstream sensor readings medium

Catalyst inefficiency can alter expected sensor voltage behavior

Lean or rich engine running condition impacting sensor output low

Underlying engine issues may affect oxygen levels

Diagnostic Steps

Connect OBD-II scanner and read P0137 plus any related codes

Expected: Code P0137 present; note any additional codes for context

Interpretation: Base diagnostic starting point
Visually inspect oxygen sensor wiring and connectors for damage, corrosion, or loose connections

Expected: No physical damage or corrosion

Interpretation: Good wiring suggests sensor or other issue
Measure sensor voltage with live data or multimeter at Bank 1 Sensor 2

Expected: Voltage above low threshold (approx >0.4V)

Interpretation: If consistently low, confirms voltage issue
Check for exhaust leaks near the downstream sensor location

Expected: No detectable leaks

Interpretation: Leaks can skew sensor readings
Test sensor heater circuit resistance and operation

Expected: Heater within spec

Interpretation: Heater failure can prevent proper sensor function

Repair Solutions

Replace Bank 1 Sensor 2 oxygen sensor medium

Estimated Cost: $100 - $450

Common effective fix; verify issue before replacement

Repair or replace damaged sensor wiring/connectors medium

Estimated Cost: $50 - $300

Addressing wiring faults prevents recurring codes

Repair exhaust leak near sensor medium

Estimated Cost: $100 - $400

Exhaust leaks can emulate sensor faults

Replace catalytic converter if restrictive or failing hard

Estimated Cost: $800 - $2500

Less common but necessary if catalyst issues confirmed

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Replacing the oxygen sensor without verifying wiring integrity or exhaust leaks

Frequently Asked Questions

What does the P0137 code mean?

When your OBD-II scanner reads P0137, it means: Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 2). This code is related to the vehicle's Emissions.

Reflecting on severity: How bad is P0137?

This is a medium priority issue. Check Engine Light illuminated; possible slight decrease in fuel economy and emissions performance

Common signs of the P0137 error code

Drivers often report: Check Engine Light illuminated, Reduced fuel efficiency, Unstable or rough idle when this code is present.

Common triggers for the P0137 error

This code is frequently triggered by: Faulty oxygen (O2) sensor Bank 1 Sensor 2, Damaged or corroded wiring/connectors in sensor circuit, Exhaust leak near Bank 1 Sensor 2.

How much does it cost to fix P0137?

Repair costs depend on the specific failure. A simple Repair or replace damaged sensor wiring/connectors replacement is relatively affordable ($50-$300), whereas a Replace catalytic converter if restrictive or failing repair is more expensive, potentially reaching $2500.

Is the P0137 code specific to Jeep?

This is a universal code. You might see P0137 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

P0137: Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 2)