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

Quick Answer

The P0135 diagnostic trouble code (DTC) for Jeep vehicles indicates an O2 sensor heater circuit malfunction in Bank 1 Sensor 1. Common causes include Faulty O2 Sensor: The O2 sensor itself may be defective and require replacement, Damaged Wiring: Wiring harness or connectors connected to the O2 sensor heater circuit may be damaged or corroded, Blown Fuse: A blown fuse in the heater circuit can prevent the O2 sensor from receiving power. 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 Jeep indicates O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
Common causes
Common causes include Faulty O2 Sensor: The O2 sensor itself may be defective and require replacement, Damaged Wiring: Wiring harness or connectors connected to the O2 sensor heater circuit may be damaged or corroded, Blown Fuse: A blown fuse in the heater circuit can prevent the O2 sensor from receiving power.
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 18, 2024
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Code P0135 Jeep Description

The P0135 diagnostic trouble code (DTC) for Jeep vehicles indicates an O2 sensor heater circuit malfunction in Bank 1 Sensor 1. This sensor is responsible for monitoring the oxygen content in the exhaust gases to ensure proper air-fuel mixture for combustion. The heater circuit in the sensor helps it reach operating temperature quickly, allowing it to provide accurate readings sooner after the engine is started. When this circuit malfunctions, the O2 sensor may take longer to reach its optimal temperature, leading to delayed or incorrect readings. This can result in poor engine performance, reduced fuel efficiency, and increased emissions.

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

Common Causes of P0135 Jeep

  1. Faulty O2 Sensor: The O2 sensor itself may be defective and require replacement.
  2. Damaged Wiring: Wiring harness or connectors connected to the O2 sensor heater circuit may be damaged or corroded.
  3. Blown Fuse: A blown fuse in the heater circuit can prevent the O2 sensor from receiving power.
  4. ECM/PCM Issue: A malfunctioning Engine Control Module (ECM) or Powertrain Control Module (PCM) can cause communication issues with the O2 sensor.

Symptoms of P0135 Jeep

  1. Check Engine Light: The most common symptom of this code is the illumination of the check engine light on the dashboard.
  2. Decreased Fuel Efficiency: A faulty O2 sensor heater circuit can lead to incorrect fuel mixture adjustments, resulting in decreased fuel efficiency.
  3. Rough Idle: The engine may experience rough or uneven idling due to inaccurate oxygen sensor readings.
  4. Engine Misfires: Incorrect air-fuel mixture can cause engine misfires, leading to a loss of power and performance.
  5. Failed Emissions Test: A malfunctioning O2 sensor can cause increased emissions, potentially causing the vehicle to fail an emissions test.

How to Fix P0135 Jeep

  1. Diagnostic Scan: Use a diagnostic scanner to retrieve the specific fault code and confirm the O2 sensor heater circuit malfunction.
  2. Inspect Wiring: Check the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test Fuse: Check and replace any blown fuses related to the O2 sensor heater circuit.
  4. Replace O2 Sensor: If the sensor itself is faulty, replace Bank 1 Sensor 1 with a new one that meets OEM specifications.
  5. Clear Codes: After completing the repair, clear the fault codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0135 Jeep

The cost of repairing a P0135 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, replacing an O2 sensor heater circuit can cost between $200 and $400, including parts and labor. It's important to note that additional diagnostic time may be required to pinpoint the exact cause of the malfunction, which can affect the overall repair cost. Be sure to consult with a qualified mechanic or repair shop to get an accurate estimate for your specific vehicle.

What does this mean?

Tech Notes for P0135 Jeep

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

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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 Jeep Code

1. What does OBDII code P0135 on a Jeep mean?

The code P0135 indicates an O2 sensor heater circuit malfunction for Bank 1 Sensor 1 on a Jeep.

2. What are the common symptoms of OBDII code P0135 on a Jeep?

Common symptoms include poor fuel efficiency, rough idling, engine misfires, and the illumination of the Check Engine Light.

3. What causes the O2 sensor heater circuit malfunction (P0135) on a Jeep?

The main causes are a faulty O2 sensor, damaged wiring or connectors, a blown fuse, or a problem with the vehicle's computer.

4. How serious is the O2 sensor heater circuit malfunction (P0135) on a Jeep?

While the vehicle may still be driveable, it is important to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

5. Can I still drive my Jeep with the OBDII code P0135 present?

It is generally safe to drive the vehicle for a short period with the code present, but it is recommended to have the issue diagnosed and repaired as soon as possible.

6. How do I repair the O2 sensor heater circuit malfunction on my Jeep (P0135)?

Repair typically involves testing the O2 sensor, checking the wiring and connectors for damage, replacing the O2 sensor if necessary, and resetting the fault code.

7. Can I fix the OBDII code P0135 on my Jeep myself?

Depending on your skill level and access to tools, you may be able to diagnose and repair the issue yourself. However, if you're unsure, it's best to seek assistance from a qualified mechanic.

8. Is it necessary to replace the O2 sensor to fix code P0135 on a Jeep?

Not always. Sometimes the issue can be resolved by repairing wiring or connectors, replacing a fuse, or addressing a problem with the vehicle's computer.

9. How can I prevent the O2 sensor heater circuit malfunction (P0135) from occurring on my Jeep in the future?

Regular maintenance, including checking the condition of sensors and wiring, can help prevent issues like P0135. Additionally, avoiding harsh driving conditions can prolong the life of these components.

10. Will resetting the fault code make the O2 sensor heater circuit malfunction (P0135) go away permanently?

Resetting the fault code may temporarily turn off the Check Engine Light, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause of the problem.

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