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P1160 Chevrolet Code - O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)

Quick Answer

The P1160 code for Chevrolet vehicles indicates a problem with the O2 reference voltage circuit, specifically a high voltage issue with the NOx sensor 1. Common causes include Faulty NOx Sensor: The high voltage condition in the O2 reference voltage circuit may be caused by a malfunctioning NOx sensor, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the voltage signal to the sensor, ECM Malfunction: A problem with the engine control module (ECM) can also trigger the high voltage condition in the O2 reference voltage circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1160 Chevrolet indicates O2 Reference Voltage Circuit High Voltage (NOx Sensor 1).
Common causes
Common causes include Faulty NOx Sensor: The high voltage condition in the O2 reference voltage circuit may be caused by a malfunctioning NOx sensor, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the voltage signal to the sensor, ECM Malfunction: A problem with the engine control module (ECM) can also trigger the high voltage condition in the O2 reference voltage circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P1160 Chevrolet Description

The P1160 code for Chevrolet vehicles indicates a problem with the O2 reference voltage circuit, specifically a high voltage issue with the NOx sensor 1. The NOx sensor is responsible for monitoring the levels of nitrogen oxide in the exhaust gases to ensure compliance with emission regulations. The O2 reference voltage circuit provides a stable voltage reference for the sensor's operation.

OBDII Code P1160 Chevrolet - O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)
P1160 Chevrolet Code - O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)

Common Causes of P1160 Chevrolet

  1. Faulty NOx Sensor: The high voltage condition in the O2 reference voltage circuit may be caused by a malfunctioning NOx sensor.
  2. Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the voltage signal to the sensor.
  3. ECM Malfunction: A problem with the engine control module (ECM) can also trigger the high voltage condition in the O2 reference voltage circuit.
  4. Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings, leading to voltage irregularities.

Symptoms of P1160 Chevrolet

  1. Check Engine Light: The most common symptom associated with the P1160 code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Poor Fuel Economy: A malfunctioning NOx sensor can lead to incorrect fuel mixture calculations, resulting in decreased fuel efficiency.
  3. Rough Idling: The engine may experience rough idling or hesitation during acceleration due to inaccurate sensor readings.
  4. Failed Emissions Test: If the NOx sensor is not functioning correctly, the vehicle may fail emissions tests due to excessive nitrogen oxide emissions.

How to Fix P1160 Chevrolet

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform further testing to pinpoint the exact cause of the high voltage condition.
  2. Inspect Wiring: Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Replace NOx Sensor: If the sensor is determined to be faulty, replace it with a new one to restore proper operation.
  4. Reset Error Codes: After completing the repair, reset the error codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1160 Chevrolet

The cost of repairing a high voltage condition in the O2 reference voltage circuit (P1160 code) for a Chevrolet vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the parts for this repair, including a new NOx sensor, wiring harness, or ECM, can range from $200 to $500. Labor costs can add an additional $150 to $300, bringing the total repair estimate to approximately $350 to $800. Keep in mind that these are rough estimates, and actual costs may vary based on your location and the specific needs of your vehicle. It is recommended to consult with a certified mechanic or auto repair shop for a more accurate cost estimate.

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Information for Specific Chevrolet 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.

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