AutoCodes – Ford – P0136 2002 Ford F150

P0136 2002 Ford F150 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 2002 Ford F150 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 6,690

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

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

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P0136 2002 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 P0136 code will set when the PCM detects that the HO2S2 signal voltage is out of range for an extended period.

OBDII Code P0136 2002 Ford F150 - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 2002 Ford F150 Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0136 2002 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 P0136 2002 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 P0136 2002 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.

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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 P0136 2002 Ford F150 Code

1. What are the common symptoms of OBDII code P0136 on a 2002 Ford F150?

- Common symptoms include poor fuel efficiency, rough idling, engine misfires, and the illumination of the check engine light.

2. What does the OBDII code P0136 indicate on a 2002 Ford F150?

- The code P0136 indicates a Heated Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2, specifically related to the downstream oxygen sensor.

3. What are some possible causes of the P0136 code on a 2002 Ford F150?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the vehicle's engine control module (ECM).

4. How can I diagnose the P0136 code on my 2002 Ford F150?

- You can diagnose the P0136 code using an OBDII scanner to read the fault codes, visually inspecting the oxygen sensor and its connections, and performing voltage tests on the sensor.

5. Can I continue driving my 2002 Ford F150 with the P0136 code?

- It is not recommended to drive your vehicle with the P0136 code as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. Is it possible to repair the P0136 code on a 2002 Ford F150 without professional help?

- Depending on your mechanical skills, you may be able to replace the oxygen sensor yourself if you have the right tools and knowledge. However, for more complex issues, it's best to consult a professional mechanic.

7. How much does it typically cost to repair the P0136 code on a 2002 Ford F150?

- The cost of repair can vary depending on the root cause of the issue. Replacing the oxygen sensor alone can range from $100 to $300, but additional repairs may increase the total cost.

8. Can a faulty oxygen sensor cause other problems in my 2002 Ford F150?

- Yes, a faulty oxygen sensor can lead to a range of issues such as poor engine performance, increased emissions, and potential damage to the catalytic converter over time.

9. How long does it take to repair the P0136 code on a 2002 Ford F150?

- The repair time can vary depending on the specific issue causing the code. Replacing the oxygen sensor typically takes around 1-2 hours, but additional diagnosis and repairs may extend the total time.

10. Will resetting the OBDII code P0136 on my 2002 Ford F150 make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the code is not addressed, the code is likely to reappear. It's important to diagnose and repair the root cause of the problem.