AutoCodesFord – P1137 1997 Ford F150

P1137 1997 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 1997 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 3,196
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jul 24, 2020
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Code P1137 1997 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 1997 Ford F150 - Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean - AutoCodes.com
P1137 1997 Ford F150 Code - Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Lean

What are the Possible Causes of the DTC P1137 1997 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 1997 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 1997 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 1997 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 1997 Ford F150 Code

1. What does the OBDII code P1137 mean on a 1997 Ford F150?

P1137 indicates that the oxygen sensor on Bank 1, Sensor 2 (downstream of the catalytic converter), is detecting a lean condition and isn't switching as expected.

2. What are the symptoms of code P1137 in a 1997 Ford F150?

Common symptoms include decreased fuel efficiency, rough idling, hesitation during acceleration, and the check engine light being illuminated.

3. What causes the P1137 code on a 1997 Ford F150?

Possible causes include a faulty oxygen sensor, exhaust leaks, air intake leaks, failing catalytic converter, or issues with the fuel system like low fuel pressure or a clogged fuel filter.

4. Can a bad oxygen sensor cause the P1137 code?

Yes, a faulty or failing heated oxygen sensor (Bank 1, Sensor 2) is a common cause of the P1137 code.

5. How do I diagnose the P1137 code on a 1997 Ford F150?

Start by inspecting the oxygen sensor and wiring for damage. Check for exhaust or intake leaks, test fuel pressure, and use a scan tool to monitor oxygen sensor readings.

6. Can a vacuum leak trigger the P1137 code on a Ford F150?

Yes, a vacuum leak can cause a lean condition, which might lead to the P1137 code being triggered.

7. How do I fix the P1137 code on a 1997 Ford F150?

Repairs may include replacing the faulty oxygen sensor, repairing exhaust or intake leaks, cleaning or replacing the fuel injectors, or addressing fuel pressure issues.

8. Is it safe to drive with the P1137 code on a 1997 Ford F150?

While the vehicle may still be drivable, ignoring the P1137 code can lead to poor fuel economy, reduced performance, and potential damage to the catalytic converter over time.

9. How much does it cost to fix the P1137 code on a 1997 Ford F150?

Repair costs vary, with oxygen sensor replacement typically costing $100–$300, while fixing leaks or fuel system issues may cost more depending on the severity.

10. Can cleaning the oxygen sensor fix the P1137 code?

Cleaning rarely resolves oxygen sensor problems. If the sensor is faulty, replacing it is usually the best solution.

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