P1273 2005 Nissan Maxima Code - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring
Quick Answer
The Air Fuel Ratio (A/F) sensor is a planar dual-cell limit current sensor. Common causes include Faulty Air fuel ratio (A/F) Sensor 1 Bank 1, Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted, Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection. 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 (A/F) Sensor 1 Bank 1, Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted, Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection.
- 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.
Code P1273 2005 Nissan Maxima Description
The sensor is capable of precise measurement λ= 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at λ = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800 C (1,292 - 1,472 F).
What are the Possible Causes of the DTC P1273 2005 Nissan Maxima?
- Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
- Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
- Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
- Fuel pressure
- Faulty Fuel injector
- Faulty Air Flow Meter
How to Fix the DTC P1273 2005 Nissan Maxima?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1273 2005 Nissan Maxima code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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
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
Code P1273 2005 Nissan Maxima comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
