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P1158 Acura Code - Air/Fuel Ratio Sensor 1 Terminal Low Voltage

Quick Answer

The P1158 diagnostic trouble code for Acura vehicles indicates a problem with the Air/Fuel Ratio Sensor 1 Terminal Low Voltage. Common causes include Faulty air/fuel ratio sensor: The sensor itself may be damaged or worn out, causing it to send incorrect voltage signals to the ECM, Wiring issues: Damaged or corroded wiring connections between the sensor and the ECM can disrupt the voltage signal, Exhaust leaks: Leaks in the exhaust system can affect the sensor's readings, leading to a low voltage signal. 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
P1158 Acura indicates Air/Fuel Ratio Sensor 1 Terminal Low Voltage.
Common causes
Common causes include Faulty air/fuel ratio sensor: The sensor itself may be damaged or worn out, causing it to send incorrect voltage signals to the ECM, Wiring issues: Damaged or corroded wiring connections between the sensor and the ECM can disrupt the voltage signal, Exhaust leaks: Leaks in the exhaust system can affect the sensor's readings, leading to a low voltage signal.
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 09, 2024
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Code P1158 Acura Description

The P1158 diagnostic trouble code for Acura vehicles indicates a problem with the Air/Fuel Ratio Sensor 1 Terminal Low Voltage. This sensor is responsible for measuring the oxygen content in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air/fuel mixture for optimal combustion. When the voltage from the sensor is detected to be too low, it means that the sensor is not functioning properly, which can lead to issues with fuel efficiency, emissions, and overall engine performance.

OBDII Code P1158 Acura - Air/Fuel Ratio Sensor 1 Terminal Low Voltage
P1158 Acura Code - Air/Fuel Ratio Sensor 1 Terminal Low Voltage

Common Causes of P1158 Acura

  1. Faulty air/fuel ratio sensor: The sensor itself may be damaged or worn out, causing it to send incorrect voltage signals to the ECM.
  2. Wiring issues: Damaged or corroded wiring connections between the sensor and the ECM can disrupt the voltage signal.
  3. Exhaust leaks: Leaks in the exhaust system can affect the sensor's readings, leading to a low voltage signal.
  4. Engine problems: Issues with the engine, such as vacuum leaks or a malfunctioning mass air flow sensor, can indirectly impact the air/fuel ratio sensor.

Symptoms of P1158 Acura

  1. Decreased fuel efficiency: A malfunctioning air/fuel ratio sensor can lead to an incorrect air/fuel mixture, causing the engine to consume more fuel than necessary.
  2. Poor engine performance: The engine may experience rough idling, hesitation, or lack of power due to incorrect fuel delivery.
  3. Increased emissions: A faulty air/fuel ratio sensor can result in higher emissions of pollutants, which can lead to a failed emissions test.
  4. Check Engine Light: The illumination of the Check Engine Light on the dashboard is a common symptom associated with this code.

How to Fix P1158 Acura

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the air/fuel ratio sensor and its wiring.
  2. Replace the air/fuel ratio sensor: If the sensor is found to be faulty, replace it with a new, OEM-quality sensor to ensure accurate readings.
  3. Check and repair wiring: Inspect the wiring connections for any damage or corrosion, and repair or replace as needed.
  4. Clear the trouble code: After completing the repair, clear the trouble code from the ECM using the diagnostic scanner to reset the Check Engine Light.
  5. Perform a test drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the sensor is providing accurate readings to the ECM.

Cost to Fix P1158 Acura

The cost of repairing the P1158 Acura code can vary depending on the specific model of the vehicle, the location of the repair shop, and the prices of parts and labor. In general, replacing an air/fuel ratio sensor can cost between $200 and $400, including parts and labor. Additional costs may be incurred if wiring repairs are necessary. It is recommended to consult with a trusted mechanic or dealership for a more accurate cost estimate based on the individual circumstances of the vehicle.

When is the Code Detected?

If the element is not activated or the Engine Control Module (ECM) terminal voltage is a set value or less for at least a set time period when the power is drawn to the A/F sensor (sensor 1) heater, a malfunction is detected and the code is stored.

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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.

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