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Engine-Codes – Lincoln – P0135 Lincoln

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

Quick Answer

The P0135 diagnostic trouble code (DTC) for Lincoln vehicles indicates a malfunction in the O2 sensor heater circuit for Bank 1 Sensor 1. Common causes include Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction, Wiring Issues: Corrosion, fraying, or damage to the wiring connected to the O2 sensor can disrupt the heater circuit, Blown Fuse: A blown fuse in the O2 sensor heater circuit can prevent the 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 Lincoln indicates O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
Common causes
Common causes include Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction, Wiring Issues: Corrosion, fraying, or damage to the wiring connected to the O2 sensor can disrupt the heater circuit, Blown Fuse: A blown fuse in the O2 sensor heater circuit can prevent the 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 Sep 11, 2024
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Code P0135 Lincoln Description

The P0135 diagnostic trouble code (DTC) for Lincoln vehicles indicates a malfunction in the O2 sensor heater circuit for Bank 1 Sensor 1. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater circuit in the O2 sensor is essential for ensuring accurate and rapid sensor response during cold starts and to reach operating temperature quickly.

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

Common Causes of P0135 Lincoln

  1. Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction.
  2. Wiring Issues: Corrosion, fraying, or damage to the wiring connected to the O2 sensor can disrupt the heater circuit.
  3. Blown Fuse: A blown fuse in the O2 sensor heater circuit can prevent the sensor from receiving power.
  4. ECM Malfunction: A malfunction in the engine control module (ECM) can also cause the O2 sensor heater circuit to malfunction.
  5. Exhaust Leak: An exhaust leak near the O2 sensor can lead to issues with the sensor's performance.

Symptoms of P0135 Lincoln

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Poor Fuel Efficiency: A malfunctioning O2 sensor can lead to decreased fuel efficiency as the ECM may not be able to optimize the air-fuel mixture.
  3. Rough Idling: The engine may experience rough idling or hesitation when the O2 sensor heater circuit is not functioning properly.
  4. Failed Emissions Test: A malfunctioning O2 sensor can cause increased emissions, potentially leading to a failed emissions test.
  5. Engine Misfires: In severe cases, a malfunctioning O2 sensor can cause engine misfires or stalling due to incorrect fuel mixture adjustments.

How to Fix P0135 Lincoln

  1. Diagnostic Scanning: Use an OBD-II scanner to retrieve the specific code and ensure it is related to the O2 sensor heater circuit.
  2. Check Wiring and Connections: Inspect the wiring and connections to the O2 sensor for any damage, corrosion, or loose connections.
  3. Test O2 Sensor: Test the O2 sensor itself to determine if it is functioning properly or needs replacement.
  4. Replace O2 Sensor: If the O2 sensor is faulty, replace it with a new sensor that meets the manufacturer's specifications.
  5. Clear Codes: After repairing the issue, clear the diagnostic trouble codes and retest the vehicle to ensure the problem has been resolved.

Cost to Fix P0135 Lincoln

The cost estimate for resolving a P0135 O2 Sensor Heater Circuit Malfunction in a Lincoln vehicle can vary depending on the specific model and labor rates in your area. Typically, the cost of replacing an O2 sensor can range from $150 to $400, including parts and labor. Additional costs may apply if wiring repairs or ECM diagnostics are required. It's advisable to consult with a professional mechanic for an accurate cost estimate based on your vehicle's make and model. Keep in mind that labor rates at auto repair shops can vary widely, so it's recommended to shop around for the best price.

What does this mean?

Tech Notes for P0135 Lincoln

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 Lincoln Code

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

P0135 indicates a malfunction in the heater circuit of the oxygen sensor located on Bank 1, Sensor 1.

2. What is Bank 1, Sensor 1 on a Lincoln vehicle?

Bank 1 refers to the side of the engine with cylinder 1, and Sensor 1 is the upstream oxygen sensor located before the catalytic converter.

3. What are the symptoms of a P0135 code on a Lincoln?

Common symptoms include an illuminated Check Engine Light, increased fuel consumption, rough idling, or failed emissions tests.

4. What causes the P0135 code to appear?

Possible causes include a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or a malfunctioning powertrain control module (PCM).

5. Can a bad oxygen sensor cause a P0135 code?

Yes, a faulty oxygen sensor is a common cause of the P0135 code, as it may fail to heat up properly.

6. How do I diagnose a P0135 code on a Lincoln?

Start by inspecting the oxygen sensor wiring and connectors for damage or corrosion, checking the sensor’s resistance, and verifying power supply to the heater circuit.

7. Can I drive my Lincoln with a P0135 code?

While you can drive with a P0135 code, it’s not recommended as it may lead to poor fuel efficiency and potential damage to the catalytic converter over time.

8. How do I fix a P0135 code on a Lincoln?

Repairs may involve replacing the oxygen sensor, repairing damaged wiring, replacing a blown fuse, or addressing issues with the PCM.

9. How much does it cost to fix a P0135 code on a Lincoln?

The cost to fix a P0135 code typically ranges from $150 to $500, depending on whether you need a new oxygen sensor or additional repairs to the wiring or PCM.

10. Can a P0135 code clear itself?

No, a P0135 code will not clear itself. The underlying issue must be repaired, and the code can then be cleared with an OBDII scanner.

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