AutoCodes – Ford – P1137 2003 Ford F150

P1137 2003 Ford F150 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 2003 Ford F150 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 2,804

How popular is this code, among other codes? Low

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
FAQs
Comments
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Code P1137 2003 Ford F150 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 2003 Ford F150 - Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean - AutoCodes.com — P1137 2003 Ford F150 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 2003 Ford F150?

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 2003 Ford F150?

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 2003 Ford F150 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 2003 Ford F150 code?

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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.

Frequently Asked Questions about P1137 2003 Ford F150 Code

1. What does the OBDII code P1137 mean on a 2003 Ford F150?

P1137 indicates that the heated oxygen sensor (HO2S) in Bank 1 Sensor 2 is not switching properly and is detecting a consistently lean condition.

2. What are the symptoms of code P1137 in a 2003 Ford F150?

Symptoms may include reduced fuel efficiency, rough idle, poor engine performance, hesitation during acceleration, and an illuminated Check Engine Light.

3. What causes the P1137 code on a Ford F150?

Common causes include a faulty oxygen sensor, exhaust leaks near the sensor, wiring or connector issues, a vacuum leak, or a malfunctioning fuel delivery system.

4. Is it safe to drive a 2003 Ford F150 with code P1137?

While the truck may still be drivable, prolonged driving with a lean condition can cause engine damage, reduced performance, and increased emissions.

5. How can I fix the P1137 code on my Ford F150?

Start by inspecting the oxygen sensor wiring and connectors for damage. If no issues are found, test and possibly replace the Bank 1 Sensor 2 oxygen sensor. Check for exhaust or vacuum leaks and ensure proper fuel delivery.

6. Where is Bank 1 Sensor 2 located on a 2003 Ford F150?

Bank 1 refers to the side of the engine with cylinder 1, and Sensor 2 is the downstream oxygen sensor located after the catalytic converter.

7. Can a bad catalytic converter cause the P1137 code?

Yes, a failing catalytic converter can affect oxygen sensor readings and contribute to this code.

8. How do I test the oxygen sensor for code P1137?

Use a multimeter or scan tool to check the voltage output of the Bank 1 Sensor 2 oxygen sensor. The voltage should fluctuate; a steady lean reading may indicate a faulty sensor.

9. Can a dirty or clogged fuel injector cause P1137?

Yes, a dirty or clogged fuel injector can lead to a lean condition and set this code.

10. Do I need a professional mechanic to fix code P1137 on my Ford F150?

While some issues, like checking connections or replacing the oxygen sensor, can be done by a DIYer, diagnosing more complex problems like fuel system issues may require a professional mechanic.