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P1159 Acura Code - Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage

Quick Answer

The P1159 Acura code indicates a problem with the Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage in the vehicle. Common causes include Faulty Air/Fuel Ratio Sensor: The sensor itself may be malfunctioning, causing low voltage readings, Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the voltage signal, Vacuum Leak: A vacuum leak in the intake system can affect the air-to-fuel ratio readings. 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
P1159 Acura indicates Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage.
Common causes
Common causes include Faulty Air/Fuel Ratio Sensor: The sensor itself may be malfunctioning, causing low voltage readings, Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the voltage signal, Vacuum Leak: A vacuum leak in the intake system can affect the air-to-fuel ratio readings.
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 10, 2024
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Code P1159 Acura Description

The P1159 Acura code indicates a problem with the Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage in the vehicle. This sensor plays a crucial role in monitoring the air-to-fuel ratio in the engine combustion process. The sensor is located in the exhaust system and sends signals to the engine control module (ECM) to adjust the fuel mixture for optimal performance and emissions control. When the voltage from the sensor is too low, it can disrupt the engine's fuel management system, leading to poor performance, decreased fuel efficiency, and increased emissions.

OBDII Code P1159 Acura - Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage
P1159 Acura Code - Air/Fuel Ratio Sensor 1 AFS+ Terminal Low Voltage

Common Causes of P1159 Acura

  1. Faulty Air/Fuel Ratio Sensor: The sensor itself may be malfunctioning, causing low voltage readings.
  2. Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the voltage signal.
  3. Vacuum Leak: A vacuum leak in the intake system can affect the air-to-fuel ratio readings.
  4. ECM Malfunction: A problem with the Engine Control Module (ECM) can also trigger the P1159 code.

Symptoms of P1159 Acura

  1. Check Engine Light: The most common symptom associated with the P1159 code is the illumination of the Check Engine Light on the dashboard.
  2. Poor Fuel Efficiency: The vehicle may experience decreased fuel efficiency due to the incorrect air-to-fuel ratio.
  3. Rough Idle: The engine may idle roughly or stall due to the disrupted fuel management system.
  4. Engine Misfires: The engine may misfire or hesitate during acceleration, indicating a problem with the air-to-fuel ratio.
  5. Increased Emissions: The vehicle may fail emissions tests or produce higher emissions than usual due to the malfunctioning sensor.

How to Fix P1159 Acura

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the fault code and perform further testing to pinpoint the exact cause of the low voltage reading.
  2. Inspect Sensor and Wiring: Check the Air/Fuel Ratio Sensor for any signs of damage or wear, and inspect the wiring and connectors for corrosion or breaks.
  3. Replace Sensor: If the sensor is faulty, replace it with a new one following manufacturer guidelines.
  4. Repair Wiring: Repair or replace any damaged wiring or connectors in the sensor circuit to ensure proper voltage readings.
  5. Clear Codes and Test: Clear the fault codes from the ECM, perform a test drive to ensure the issue is resolved, and recheck for any pending codes.

Cost to Fix P1159 Acura

The typical repair costs for addressing the P1159 Acura code can vary depending on the specific cause of the issue and the parts/labour required. On average, the cost of replacing the Air/Fuel Ratio Sensor can range from $200 to $400, including parts and labour. Additional costs may apply if wiring repairs or ECM diagnostics are needed. It's important to note that labour rates at auto repair shops can vary, typically ranging between $80 and $150 per hour. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. For a precise cost estimate, it's recommended to consult with local auto repair shops.

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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