Engine-Codes.com
Engine-Codes – Ford – P0135 Ford

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

Quick Answer

The P0135 Ford code indicates a malfunction in the O2 (oxygen) sensor heater circuit of Bank 1 Sensor 1. Common causes include Faulty O2 sensor heater element, Wiring or connector issues in the heater circuit, Blown fuse related to the O2 sensor. 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 Ford indicates O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
Common causes
Common causes include Faulty O2 sensor heater element, Wiring or connector issues in the heater circuit, Blown fuse related to the O2 sensor.
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 Aug 25, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0135 Ford Description

The P0135 Ford code indicates a malfunction in the O2 (oxygen) sensor heater circuit of Bank 1 Sensor 1. This sensor is responsible for measuring the oxygen content in the exhaust gases, which helps the engine control module (ECM) adjust the air-fuel mixture for optimal combustion. The heater circuit in the sensor ensures that it reaches operating temperature quickly for accurate readings. When this circuit malfunctions, it can lead to incorrect readings and affect the engine's performance and emissions.

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

Common Causes of P0135 Ford

  1. Faulty O2 sensor heater element
  2. Wiring or connector issues in the heater circuit
  3. Blown fuse related to the O2 sensor
  4. ECM malfunction affecting the heater circuit
  5. Exposure to extreme temperatures causing sensor damage

Symptoms of P0135 Ford

  1. Decreased fuel efficiency
  2. Rough idle or stalling
  3. Engine hesitation or misfires
  4. Illuminated check engine light
  5. Failed emissions test

How to Fix P0135 Ford

  1. Perform a diagnostic scan to confirm the P0135 code.
  2. Inspect the O2 sensor wiring and connectors for damage or corrosion.
  3. Test the O2 sensor heater element for continuity and proper operation.
  4. Check and replace any blown fuses related to the O2 sensor heater circuit.
  5. If necessary, replace the Bank 1 Sensor 1 O2 sensor with a new, OEM-quality unit.

Cost to Fix P0135 Ford

The typical repair costs for addressing a P0135 Ford code can range from $150 to $300, including parts and labor. However, prices can vary based on the specific vehicle make and model, the location of the repair shop, and the hourly labor rates. It's recommended to obtain quotes from local auto repair shops to get a more accurate estimate for this repair.

What does this mean?

Tech Notes for P0135 Ford

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. The code is triggered when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the sensor and connector are OK, replacing the O2 Sensor 1 usually takes care of the problem

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

Need more information about the P0135 Ford code?

Need more information on how to fix the P0135 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0135 Ford code diagnosed by a professional: Find a repair shop in your area

Information for Specific Ford Models

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 Ford Code

1. What does the OBDII code P0135 in a Ford mean?

The code P0135 indicates an O2 Sensor Heater Circuit Malfunction in Bank 1 Sensor 1 in a Ford vehicle.

2. What are the common symptoms of a P0135 OBDII code in a Ford?

Common symptoms of a P0135 code include poor fuel economy, rough idling, engine hesitation, and possibly a Check Engine light illuminated on the dashboard.

3. What causes the P0135 O2 Sensor Heater Circuit Malfunction in a Ford?

The most common causes of a P0135 code in a Ford are a faulty O2 sensor, a damaged O2 sensor heater circuit, wiring issues, or a blown fuse related to the O2 sensor.

4. How can I diagnose a P0135 code in my Ford?

To diagnose a P0135 code, you can use an OBDII scanner to retrieve the code and then inspect the O2 sensor, its heater circuit, and related wiring for any signs of damage or malfunction.

5. Can I drive my Ford with a P0135 OBDII code?

It is not recommended to drive your Ford with a P0135 code for an extended period, as it can lead to decreased engine performance and potential damage to the catalytic converter.

6. How do I repair a P0135 code in my Ford?

Repairing a P0135 code typically involves replacing the faulty O2 sensor or repairing any damaged wiring or components in the O2 sensor heater circuit.

7. Are there any DIY tips for fixing a P0135 OBDII code in a Ford?

While some experienced DIYers may attempt to replace the O2 sensor themselves, it is recommended to consult a professional mechanic for proper diagnosis and repair of a P0135 code.

8. Is it expensive to repair a P0135 code in a Ford?

The cost of repairing a P0135 code in a Ford can vary depending on the root cause of the issue, but it typically involves replacing the O2 sensor or repairing related components, which may incur moderate costs.

9. How often does a P0135 OBDII code occur in Ford vehicles?

The occurrence of a P0135 code in Ford vehicles can vary, but it is a relatively common issue that can arise due to normal wear and tear on the O2 sensor and its components.

10. Can a P0135 code in a Ford cause other problems if left unrepaired?

If left unrepaired, a P0135 code in a Ford can potentially lead to decreased fuel efficiency, engine performance issues, increased emissions, and long-term damage to the catalytic converter.

Discuss the causes and fixes for P0135 Ford OBDII Code

Submit a New Comment

  • Have code p0135 changed bank 1 sensor 1 o2 and bank 1 sensor 2 o2 light still on

    Reply to Comment

  • What model and year is your Ford?

    Reply to Comment

  • Well on my ford focus I have a race header with only 1 O2 sensor in it with a race exhaust. I JUST flashed my ECU from FSWerk with a X3 SCT programmer.. THIS code wasn't there before the flash now it is..

    Reply to Comment

  • Where is sensor #1 located?

    Reply to Comment

  • What model and year is your Ford?

    Reply to Comment

  • 1998 Mustang. 3.8L V6

    Reply to Comment

  • Hi, have P0135 on Ford Galaxy 2.0 TDCI, late 2011. Have been told O2 sensor needs replacing. Trying to source the correct part from eurocarparts. Can you please advise the part number and location? many thanks in advance

    Reply to Comment