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P1279 2004 Nissan Maxima Code - Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response

Quick Answer

The P1279 diagnostic trouble code (DTC) for a 2004 Nissan Maxima indicates a problem with the Air Fuel Ratio Sensor 1 on Bank 1, specifically a slow response from the sensor. Common causes include Faulty Air Fuel Ratio Sensor, Wiring or connector issues, Exhaust leaks near the sensor. 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
P1279 2004 Nissan Maxima indicates Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response.
Common causes
Common causes include Faulty Air Fuel Ratio Sensor, Wiring or connector issues, Exhaust leaks near the sensor.
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 Aug 19, 2024
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Code P1279 2004 Nissan Maxima Description

The P1279 diagnostic trouble code (DTC) for a 2004 Nissan Maxima indicates a problem with the Air Fuel Ratio Sensor 1 on Bank 1, specifically a slow response from the sensor. The Air Fuel Ratio Sensor is responsible for monitoring the air-to-fuel ratio in the exhaust system and providing feedback to the engine control module (ECM) to adjust fuel delivery for optimal combustion. A slow response from the sensor can lead to incorrect fuel mixture adjustments, which can result in poor engine performance, decreased fuel efficiency, and increased emissions.

OBDII Code P1279 2004 Nissan Maxima - Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response
P1279 2004 Nissan Maxima Code - Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response

Common Causes of P1279 2004 Nissan Maxima

  1. Faulty Air Fuel Ratio Sensor
  2. Wiring or connector issues
  3. Exhaust leaks near the sensor
  4. Vacuum leaks in the intake system
  5. ECM software or hardware problems

Symptoms of P1279 2004 Nissan Maxima

  1. Decreased fuel efficiency
  2. Engine misfires or hesitation
  3. Rough idling or stalling
  4. Check Engine Light illuminated
  5. Increased emissions

How to Fix P1279 2004 Nissan Maxima

  1. Diagnose the issue by scanning the vehicle's ECM for fault codes and performing a visual inspection of the sensor and its wiring.
  2. Test the Air Fuel Ratio Sensor's response time using a multimeter or scan tool to verify slow response.
  3. Replace the Air Fuel Ratio Sensor if it fails the response time test, ensuring the new sensor meets OEM specifications.
  4. Check and repair any damaged wiring or connectors related to the sensor.
  5. Clear the fault codes, reset the ECM, and perform a test drive to confirm the repair.

Cost to Fix P1279 2004 Nissan Maxima

The cost of repairing a P1279 code on a 2004 Nissan Maxima can vary depending on the location, parts needed, and labor rates. Typically, the cost of a new Air Fuel Ratio Sensor can range from $100 to $300, with additional costs for labor averaging between $100 and $200. Overall, the total repair cost could range from $200 to $500. It's advisable to consult with a trusted mechanic or auto repair shop to obtain a more accurate estimate based on your specific vehicle and location.

When is the Code Detected?

The response (from RICH to LEAN) of the A/F signal computed by ECM from A/F sensor 1 signal takes more than the specified time.

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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 P1279 2004 Nissan Maxima Code

1. What does the OBDII code P1279 mean on a 2004 Nissan Maxima?

P1279 indicates a problem with the Air Fuel Ratio Sensor 1 (Bank 1), specifically a slow response in the sensor's circuit, which may affect engine performance and emissions.

2. What are the common symptoms of code P1279 in a 2004 Nissan Maxima?

Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, reduced engine performance, and an illuminated Check Engine Light.

3. What causes the P1279 code in a 2004 Nissan Maxima?

Potential causes include a faulty air-fuel ratio sensor, damaged wiring or connectors in the sensor circuit, exhaust leaks, or issues with the engine control module (ECM).

4. Can I drive my 2004 Nissan Maxima with a P1279 code?

While the car may still run, driving with a P1279 code can lead to reduced performance, higher emissions, and potential damage to the catalytic converter if left unresolved.

5. How do I fix the P1279 code on my 2004 Nissan Maxima?

Repairs may include replacing the faulty air-fuel ratio sensor, repairing damaged wiring or connectors, fixing any exhaust leaks, or updating/reprogramming the ECM if necessary.

6. How much does it cost to repair a P1279 code on a 2004 Nissan Maxima?

The cost varies depending on the issue, but replacing an air-fuel ratio sensor typically costs between $200 and $400, including parts and labor.

7. How can I diagnose the P1279 code in my 2004 Nissan Maxima?

Start by inspecting the air-fuel ratio sensor, wiring, and connectors for damage. Use a scan tool to monitor sensor response times and compare them to manufacturer specifications.

8. Can an exhaust leak cause the P1279 code in a 2004 Nissan Maxima?

Yes, an exhaust leak near the air-fuel ratio sensor can cause inaccurate readings and trigger the P1279 code.

9. Is the air-fuel ratio sensor the same as an oxygen sensor in a 2004 Nissan Maxima?

No, while they serve similar functions, the air-fuel ratio sensor provides more precise data to the ECM for controlling the air-fuel mixture, especially in modern engines.

10. How do I prevent the P1279 code from occurring again in my 2004 Nissan Maxima?

Regular maintenance, such as inspecting exhaust components, keeping the engine tuned, and promptly addressing Check Engine Light issues, can help prevent recurrence.

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