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Engine-Codes – Ford – P0135 1999 Ford F150

P0135 1999 Ford F150 Code - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Quick Answer

The O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1 diagnostic trouble code (DTC) P0135 in a 1999 Ford F150 indicates an issue with the oxygen sensor located in the exhaust system. Common causes include Faulty oxygen sensor heater element, Wiring or connector issues in the O2 sensor circuit, Blown fuse related to the O2 sensor heater. 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
P0135 1999 Ford F150 indicates O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
Common causes
Common causes include Faulty oxygen sensor heater element, Wiring or connector issues in the O2 sensor circuit, Blown fuse related to the O2 sensor heater.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P0135 1999 Ford F150 Description

The O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1 diagnostic trouble code (DTC) P0135 in a 1999 Ford F150 indicates an issue with the oxygen sensor located in the exhaust system. This sensor, known as the upstream or pre-catalytic converter oxygen sensor, is responsible for monitoring the oxygen levels in the exhaust gases. The heater circuit malfunction refers to a problem with the heating element in the sensor that helps it reach operating temperature quickly for optimal performance.

OBDII Code P0135 1999 Ford F150 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1
P0135 1999 Ford F150 Code - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Common Causes of P0135 1999 Ford F150

  1. Faulty oxygen sensor heater element.
  2. Wiring or connector issues in the O2 sensor circuit.
  3. Blown fuse related to the O2 sensor heater.
  4. Engine coolant temperature sensor malfunction affecting O2 sensor performance.
  5. Engine computer (PCM) failure.

Symptoms of P0135 1999 Ford F150

  1. Check engine light illuminated on the dashboard.
  2. Reduced fuel efficiency.
  3. Rough idling or stalling.
  4. Engine hesitation or surging.
  5. Increased emissions.

How to Fix P0135 1999 Ford F150

  1. Begin by locating the Bank 1 Sensor 1 oxygen sensor, typically found near the exhaust manifold.
  2. Check the wiring and connector for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the oxygen sensor heater element for continuity using a multimeter. Replace the sensor if the heater element is faulty.
  4. Inspect the fuse related to the O2 sensor heater circuit and replace if blown.
  5. Clear the DTC from the vehicle's computer using a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0135 1999 Ford F150

The typical repair costs for a P0135 code on a 1999 Ford F150 can range from $150 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for P0135 1999 Ford F150

During testing the HO2S Heaters are checked for opens/shorts and excessive current draw. The test fails when current draw exceeds a calibrated limit and/or an open or short is detected.

When is the Code Detected?

Current amperage in the front heated oxygen sensor heater circuit is out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heat

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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 P0135 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P0135 on a 1999 Ford F150?

- Common symptoms include poor fuel economy, rough idling, and the illumination of the Check Engine Light.

2. What does the O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1 mean for a 1999 Ford F150?

- This code indicates an issue with the oxygen sensor's heating element in the exhaust system of the first bank of cylinders.

3. What are the possible causes of the O2 Sensor Heater Circuit Malfunction in a 1999 Ford F150?

- Potential causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the vehicle's computer.

4. How can I diagnose the OBDII code P0135 on my 1999 Ford F150?

- Diagnose the code by checking the oxygen sensor's wiring, testing the sensor's resistance, and inspecting the fuse related to the sensor heater circuit.

5. Can I still drive my 1999 Ford F150 with the P0135 code?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent further damage and ensure optimal performance.

6. How do I repair the O2 Sensor Heater Circuit Malfunction on a 1999 Ford F150?

- The repair typically involves replacing the faulty oxygen sensor, repairing damaged wiring or connectors, and resetting the Check Engine Light after the issue is fixed.

7. Are there any tips for preventing the recurrence of the P0135 code on a 1999 Ford F150?

- Ensure proper maintenance of the vehicle, use high-quality oxygen sensors, and address any underlying issues promptly to prevent the code from reoccurring.

8. Can a DIY enthusiast fix the OBDII code P0135 on a 1999 Ford F150?

- Yes, a DIY enthusiast with some mechanical knowledge and the right tools can often diagnose and repair the O2 Sensor Heater Circuit Malfunction with guidance from repair manuals or online resources.

9. Will resetting the Check Engine Light resolve the P0135 code on a 1999 Ford F150?

- Resetting the Check Engine Light may temporarily turn it off, but it will not fix the underlying issue causing the O2 Sensor Heater Circuit Malfunction. The problem needs to be diagnosed and repaired.

10. Is it necessary to replace the oxygen sensor when dealing with the P0135 code on a 1999 Ford F150?

- In many cases, replacing the oxygen sensor is the most effective solution to resolve the O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1 on a 1999 Ford F150.

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