AutoCodes – Ford – P0136 Ford

P0136 Ford Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

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 Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0136 Ford indicates Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2.
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
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
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Code Popularity 83,823
How popular is this code, among other codes? Medium
Table of contents Created and updated by William Orellana on Jul 24, 2020
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Code P0136 Ford 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 P0136 code will set when the PCM detects that the HO2S2 signal voltage is out of range for an extended period.
OBDII Code P0136 Ford - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com
P0136 Ford Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What are the Possible Causes of the DTC P0136 Ford?

  • 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 P0136 Ford?

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 P0136 Ford 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 P0136 Ford code?

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Information for Specific Ford Models

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 P0136 Ford Code

1. What does the OBDII code P0136 for Ford mean?

The code P0136 indicates a Heated Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2, which is typically the downstream oxygen sensor after the catalytic converter.

2. What are the common symptoms of a P0136 code?

Common symptoms of a P0136 code may include poor fuel economy, rough idling, engine misfires, and an illuminated check engine light on the dashboard.

3. What are the possible causes of a P0136 code in a Ford vehicle?

Potential causes of a P0136 code in a Ford vehicle include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, a malfunctioning catalytic converter, or issues with the engine control module (ECM).

4. How can I diagnose a P0136 code in my Ford?

To diagnose a P0136 code, you can use an OBDII scanner to read the code and check the oxygen sensor's voltage and response. You may also need to inspect the sensor's wiring and connectors for any damage or corrosion.

5. How serious is a P0136 code in a Ford?

While a P0136 code may not cause immediate harm to your vehicle, it can lead to decreased fuel efficiency and increased emissions. It is advisable to address the issue promptly to prevent further damage to the engine or catalytic converter.

6. Can I drive my Ford with a P0136 code?

It is generally safe to drive your Ford with a P0136 code, but you may experience reduced fuel efficiency and performance. It is recommended to have the issue diagnosed and repaired as soon as possible.

7. How much does it cost to repair a P0136 code in a Ford?

The cost of repairing a P0136 code in a Ford can vary depending on the cause of the issue. Replacing the oxygen sensor or repairing wiring may cost between $100 to $300, while fixing a catalytic converter can be more expensive.

8. Can I fix a P0136 code myself?

If you have experience working on vehicles, you may be able to fix a P0136 code yourself by replacing the oxygen sensor or repairing damaged wiring. However, if you are unsure, it is best to consult a professional mechanic.

9. How long does it take to repair a P0136 code in a Ford?

The repair time for a P0136 code in a Ford can vary depending on the cause of the issue and the extent of the repairs needed. It may take anywhere from 30 minutes to a few hours to complete the repair.

10. How can I prevent a P0136 code from recurring in my Ford?

To prevent a P0136 code from recurring in your Ford, it is essential to perform regular maintenance on your vehicle, such as checking and replacing oxygen sensors as recommended, ensuring proper fuel and air intake, and addressing any exhaust leaks promptly.

Discuss the causes and fixes for P0136 Ford OBDII Code

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