AutoCodes – Ford – P0136 1997 Ford F150

P0136 1997 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 1997 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 6,938

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

OBDII Code P0136 1997 Ford F150 - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 1997 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 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 P0136 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 P0136 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.

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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 1997 Ford F150 Code

1. What are the common symptoms of OBDII code P0136 on a 1997 Ford F150?

- Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the Check Engine light.

2. What does the OBDII code P0136 "Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2" mean for a 1997 Ford F150?

- This code indicates that there is a malfunction in the heated oxygen sensor circuit of the downstream (post-catalytic converter) oxygen sensor in bank 1 of the engine.

3. What are the possible causes of OBDII code P0136 on a 1997 Ford F150?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, exhaust leaks near the sensor, or an issue with the engine's computer system.

4. How can I diagnose the cause of OBDII code P0136 on my 1997 Ford F150?

- Diagnosing this code typically involves using an OBDII scanner to retrieve the specific error code, inspecting the oxygen sensor and its wiring for damage, and checking for exhaust leaks near the sensor.

5. Can I continue to drive my 1997 Ford F150 with OBDII code P0136?

- It is generally not recommended to drive the vehicle with this code unresolved, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

6. Is it possible to repair OBDII code P0136 on a 1997 Ford F150 myself?

- Depending on your experience and access to tools, you may be able to repair this code yourself by replacing the affected oxygen sensor, repairing damaged wiring, or addressing any exhaust leaks near the sensor.

7. How much does it typically cost to repair OBDII code P0136 on a 1997 Ford F150 at a professional mechanic's shop?

- The cost of repairing this code can vary depending on the exact cause, but it may range from $100 to $300 for parts and labor at a professional mechanic's shop.

8. Can resetting the Check Engine light resolve OBDII code P0136 on a 1997 Ford F150?

- Resetting the Check Engine light may temporarily turn it off, but it will not fix the underlying issue causing the code. It is recommended to diagnose and repair the problem to prevent further issues.

9. How often should the oxygen sensors be replaced on a 1997 Ford F150 to prevent OBDII code P0136?

- Oxygen sensors typically have a lifespan of 60,000 to 100,000 miles, so it is recommended to replace them within this mileage range to prevent issues like OBDII code P0136.

10. Can a malfunctioning oxygen sensor causing OBDII code P0136 affect the performance of my 1997 Ford F150?

- Yes, a malfunctioning oxygen sensor can lead to decreased fuel efficiency, poor engine performance, and potential damage to the catalytic converter if left unresolved.