Engine-Codes.com
Engine-Codes – Nissan – P1273 2005 Nissan Maxima

P1273 2005 Nissan Maxima Code - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring

Quick Answer

The P1273 code on a 2005 Nissan Maxima indicates a problem with the Air Fuel Ratio Sensor 1 on Bank 1, specifically related to lean shift monitoring. Common causes include Faulty air fuel ratio sensor, Vacuum leak in the intake system, Clogged fuel injector. 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
P1273 2005 Nissan Maxima indicates Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring.
Common causes
Common causes include Faulty air fuel ratio sensor, Vacuum leak in the intake system, Clogged fuel injector.
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 16, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1273 2005 Nissan Maxima Description

The P1273 code on a 2005 Nissan Maxima indicates a problem with the Air Fuel Ratio Sensor 1 on Bank 1, specifically related to lean shift monitoring. 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 sensor detects a lean condition, it means that there is an imbalance in the air-fuel ratio, with too much air and not enough fuel being supplied to the engine.

OBDII Code P1273 2005 Nissan Maxima - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring
P1273 2005 Nissan Maxima Code - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring

Common Causes of P1273 2005 Nissan Maxima

  1. Faulty air fuel ratio sensor
  2. Vacuum leak in the intake system
  3. Clogged fuel injector
  4. Dirty mass airflow sensor
  5. Fuel delivery system issue

Symptoms of P1273 2005 Nissan Maxima

  1. Rough idle or stalling
  2. Reduced power and acceleration
  3. Engine misfires or hesitation
  4. Increased fuel consumption
  5. Check Engine Light illuminated

How to Fix P1273 2005 Nissan Maxima

  1. Diagnose the root cause by performing a thorough inspection of the air fuel ratio sensor, intake system, fuel injectors, and mass airflow sensor.
  2. Replace the faulty air fuel ratio sensor if it is determined to be the cause of the lean condition.
  3. Repair any vacuum leaks in the intake system by replacing damaged hoses or gaskets.
  4. Clean or replace clogged fuel injectors to ensure proper fuel delivery.
  5. Clean the mass airflow sensor to improve air intake measurement accuracy.

Cost to Fix P1273 2005 Nissan Maxima

The typical repair costs for addressing a P1273 code on a 2005 Nissan Maxima can vary depending on the specific cause of the issue. Generally, replacing the air fuel ratio sensor can cost between $150 and $300, including parts and labor. Diagnosing and repairing vacuum leaks, clogged fuel injectors, or a dirty mass airflow sensor may incur additional costs. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150.

What does this mean?

Tech Notes for P1273 2005 Nissan Maxima

If one or more sensors are replaced the Engine Control Module (ECM) Mixture Ratio Self-Learning clearing procedure must be performed.

Maxima ECM Self-Learning procedure



There are factory service bulletins for the 2005 Nissan Maxima:



2005 Nissan Maxima

2005 Nissan Maxima Factory Service Bulletin OBDII Code P1273



2005 Nissan Maxima

2005 Nissan Maxima Factory Service Bulletin OBDII Code P1273











User Submitted Video

When is the Code Detected?

The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the lean side for a specified period.

Need more information about the P1273 2005 Nissan Maxima code?

Need more information on how to fix the P1273 2005 Nissan Maxima code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1273 2005 Nissan Maxima code diagnosed by a professional: Find a repair shop in your area

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 P1273 2005 Nissan Maxima Code

1. What does the OBDII code P1273 mean on a 2005 Nissan Maxima?

P1273 indicates that the Air Fuel Ratio Sensor 1 (Bank 1) has detected a lean condition or improper air-fuel mixture during lean shift monitoring.

2. What are the symptoms of code P1273 in a 2005 Nissan Maxima?

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

3. What causes the P1273 code to appear on a 2005 Nissan Maxima?

Possible causes include a faulty Air Fuel Ratio Sensor, exhaust leaks near Bank 1, intake vacuum leaks, a malfunctioning fuel injector, or incorrect fuel pressure.

4. Can a dirty mass airflow (MAF) sensor cause the P1273 code?

Yes, a dirty or faulty MAF sensor can send incorrect air measurement signals, leading to a lean condition and triggering the P1273 code.

5. How do you diagnose the P1273 code on a 2005 Nissan Maxima?

Diagnosis involves checking for exhaust leaks, testing the Air Fuel Ratio Sensor, inspecting vacuum hoses, cleaning or replacing the MAF sensor, and verifying fuel pressure and injector operation.

6. Can you drive with the P1273 code on a 2005 Nissan Maxima?

Driving with the P1273 code is not recommended, as it can cause further engine damage, reduced performance, and increased fuel consumption.

7. How is the P1273 code fixed on a 2005 Nissan Maxima?

Repairs may include replacing the Air Fuel Ratio Sensor, fixing exhaust leaks, cleaning or replacing the MAF sensor, repairing vacuum leaks, or addressing fuel system issues.

8. Will replacing the Air Fuel Ratio Sensor fix the P1273 code?

Replacing the sensor may fix the issue if it is confirmed to be faulty, but the underlying cause, such as leaks or fuel delivery problems, should also be addressed.

9. What tools are needed to troubleshoot the P1273 code?

Tools include an OBDII scanner, a multimeter for electrical testing, a vacuum gauge, and sometimes a smoke machine for detecting leaks.

10. How much does it cost to fix a P1273 code on a 2005 Nissan Maxima?

The repair cost varies, ranging from $150–$400 for sensor replacement to more if additional repairs, like fixing exhaust or vacuum leaks, are necessary.

Discuss the causes and fixes for P1273 2005 Nissan Maxima OBDII Code

Submit a New Comment

Code P1273 2005 Nissan Maxima comments

No comments found for this page.