AutoCodes – Generic – P1137

P1137 Code - Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean

Quick Answer

The Heated Oxygen Sensor 2 (HO2S2) (Downstream), after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Exhaust gas leaks, Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1, Heated Oxygen Sensor 2 Bank 1 harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1137 indicates Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean.
Common causes: Common causes include Exhaust gas leaks, Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1, Heated Oxygen Sensor 2 Bank 1 harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 54,352

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1137 Description

The Heated Oxygen Sensor 2 (HO2S2) (Downstream), after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air-fuel mixture (air-fuel ratio) must maintain near the ideal stoichiometric ratio. The HO2S2 output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Powertrain Control Module (PCM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S2 generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The PCM interprets Lean when the HO2S2 voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The PCM interprets Rich when the HO2S2 voltage is above 0.45 V. The P1137 code will set when the PCM detects that the HO2S2 signal is below the voltage of range for an extended period.

OBDII Code P1137 - Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean - AutoCodes.com — P1137 Code - Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean

What does this mean?

What are the Possible Causes of the DTC P1137?

Exhaust gas leaks
Faulty Heated Oxygen Sensor 2 (HO2S2) (Downstream) Bank 1
Heated Oxygen Sensor 2 Bank 1 harness is open or shorted
Heated Oxygen Sensor 2 Bank 1 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors

How to Fix the DTC P1137?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1137 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1137 code?

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Need Help with the Code?

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Information for Specific Makes

P1137 Audi — Long Term Fuel Trim Add. Fuel B1 System Too Rich
P1137 BMW — O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2
P1137 Buick — HO2S Circuit Low Voltage Sensor 2
P1137 Cadillac — HO2S Bank 1 Sensor 2 Lean Or Low Voltage
P1137 Chevrolet — HO2S Bank 1 Sensor 2 Lean System or Low Voltage
P1137 Ford — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean
P1137 GMC — HO2S Bank 1 Sensor 2 Lean System or Low Voltage
P1137 Infiniti — Swirl Control Valve Control Position Sensor Circuit
P1137 Isuzu — HO2S 1 Rich Condition HO2S 2 Lean Condition
P1137 Lincoln — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean
P1137 Mazda — Rear O2 Sensor Self Test Fault
P1137 Mercury — Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean
P1137 MINI — O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2
P1137 Nissan — Swirl Control Valve Control Position Sensor Circuit
P1137 Pontiac — HO2S Bank 1 Sensor 2 Lean Or Low Voltage
P1137 Saturn — HO2S Bank 1 Sensor 2 Lean Or Low Voltage
P1137 Subaru — Oxygen Sensor Circuit Bank 1 Sensor 1
P1137 Suzuki — HO2S Circuit Low Voltage During Power Enrichment Sensor 2
P1137 Volkswagen — Long Term Fuel Trim Add. Fuel B1 System Too Rich

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.