AutoCodes – Ford – P0136 2003 Ford F150

P0136 2003 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 2003 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 8,194

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 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 P0136 code will set when the PCM detects that the HO2S2 signal voltage is out of range for an extended period.

OBDII Code P0136 2003 Ford F150 - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 2003 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 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 P0136 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 P0136 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.

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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 2003 Ford F150 Code

1. What are the common symptoms of OBDII code P0136 on a 2003 Ford F150?

- Common symptoms include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.

2. What does the OBDII code P0136 indicate specifically for a 2003 Ford F150?

- P0136 indicates a Heated Oxygen Sensor Circuit Malfunction for Bank 1 Sensor 2 on the 2003 Ford F150.

3. What are the possible causes of a P0136 code on a 2003 Ford F150?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or a malfunctioning engine control module.

4. How can I diagnose a Heated Oxygen Sensor Circuit Malfunction on Bank 1 Sensor 2 in a 2003 Ford F150?

- Diagnose by visually inspecting the sensor and its wiring, testing the sensor's resistance, and using a scan tool to monitor sensor data.

5. Can I drive my 2003 Ford F150 with a P0136 code?

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

6. How do I repair a Heated Oxygen Sensor Circuit Malfunction on my 2003 Ford F150?

- Repair involves replacing the faulty oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or reprogramming the engine control module.

7. Is it necessary to replace the oxygen sensor when dealing with a P0136 code on a 2003 Ford F150?

- Yes, replacing the oxygen sensor is often necessary to resolve the Heated Oxygen Sensor Circuit Malfunction on Bank 1 Sensor 2.

8. Can a DIY enthusiast repair a P0136 code on a 2003 Ford F150?

- While some aspects of diagnosing and repairing a P0136 code can be done by a DIY enthusiast, it is recommended to consult a professional for accurate diagnosis and repair.

9. How much does it typically cost to repair a P0136 code on a 2003 Ford F150?

- The cost of repairing a P0136 code can vary depending on the cause, but it typically ranges from $100 to $300 for parts and labor.

10. What other related issues should I be aware of when dealing with a Heated Oxygen Sensor Circuit Malfunction on a 2003 Ford F150?

- Other related issues may include poor engine performance, failed emissions tests, and potential damage to the catalytic converter if left unresolved.