AutoCodes – Ford – P0136 1999 Ford F150

P0136 1999 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 1999 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 8,963

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 1999 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 1999 Ford F150 - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 1999 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 1999 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 1999 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 1999 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 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P0136 on a 1999 Ford F150?

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

2. What does the OBDII code P0136 indicate for a 1999 Ford F150?

- The code P0136 indicates a malfunction in the heated oxygen sensor circuit for Bank 1 Sensor 2 in the exhaust system.

3. What are the possible causes of the OBDII code P0136 on a 1999 Ford F150?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's fuel mixture.

4. How can I diagnose the cause of OBDII code P0136 on my 1999 Ford F150?

- Diagnose the issue by inspecting the oxygen sensor and its wiring, checking for exhaust leaks, and using an OBDII scanner to monitor sensor readings.

5. Can I still drive my 1999 Ford F150 with the OBDII code P0136?

- It is not recommended to drive with a P0136 code as it can lead to poor engine performance and potential damage if left unresolved.

6. How can I repair the Heated Oxygen Sensor Circuit Malfunction on my 1999 Ford F150?

- The repair may involve replacing the Bank 1 Sensor 2 oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or addressing fuel mixture issues.

7. Is it possible to reset the OBDII code P0136 on a 1999 Ford F150 without fixing the issue?

- While you can clear the code with an OBDII scanner, it is crucial to address the underlying problem to prevent further issues.

8. How much does it cost to fix the OBDII code P0136 on a 1999 Ford F150?

- The cost varies depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast repair the OBDII code P0136 on a 1999 Ford F150?

- With the right tools and knowledge, some DIY enthusiasts can replace the oxygen sensor or address wiring issues, but professional help is advisable for complex repairs.

10. What are the long-term consequences of ignoring the OBDII code P0136 on a 1999 Ford F150?

- Ignoring the code can lead to reduced fuel efficiency, engine performance issues, increased emissions, and potential damage to the catalytic converter over time.