P1273 Infiniti Code - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring
Quick Answer
The P1273 Infiniti code indicates an issue with the Air Fuel Ratio Sensor 1 on Bank 1, specifically related to lean shift monitoring. Common causes include Faulty Air Fuel Ratio Sensor 1, Vacuum leaks in the intake system, Clogged fuel injectors. 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 Infiniti indicates Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring.
- Common causes
- Common causes include Faulty Air Fuel Ratio Sensor 1, Vacuum leaks in the intake system, Clogged fuel injectors.
- 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.
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Code P1273 Infiniti Description
The P1273 Infiniti code indicates an issue with the Air Fuel Ratio Sensor 1 on Bank 1, specifically related to lean shift monitoring. This sensor is responsible for monitoring the air-fuel mixture entering the engine and ensuring it is at the optimal ratio for combustion. When the sensor detects a lean condition, meaning there is too much air and not enough fuel in the mixture, it triggers this diagnostic trouble code. A lean air-fuel ratio can lead to poor engine performance, reduced fuel efficiency, and potential damage to the engine over time.
Common Causes of P1273 Infiniti
- Faulty Air Fuel Ratio Sensor 1
- Vacuum leaks in the intake system
- Clogged fuel injectors
- Issues with the fuel pressure regulator
- Exhaust leaks near the sensor
Symptoms of P1273 Infiniti
- Decreased fuel efficiency
- Rough idling or stalling
- Engine misfires
- Difficulty starting the vehicle
- Check Engine Light illuminated on the dashboard
How to Fix P1273 Infiniti
- Use an OBD-II scanner to confirm the P1273 code and pinpoint the issue
- Inspect the Air Fuel Ratio Sensor 1 on Bank 1 for any damage or contamination
- Check for vacuum leaks and repair or replace any damaged hoses
- Clean or replace clogged fuel injectors
- Test the fuel pressure regulator and replace if necessary
Cost to Fix P1273 Infiniti
The cost of repairing a P1273 Infiniti code can vary depending on the specific cause of the issue. In general, replacing the Air Fuel Ratio Sensor 1 can cost between $100 and $300 for the part alone. Labor costs at an auto repair shop can range from $100 to $200 per hour, and additional costs for diagnostic testing and any other necessary repairs should be factored in. Overall, the total repair cost for this issue can range from $200 to $600 or more, depending on the extent of the problem and the shop's rates.
Tech Notes for P1273 Infiniti
There is a Factory Service Bulletin for the following Infiniti models:
2003-2012 Infiniti FX
2002 Infiniti G20
2003-2006 Infiniti G35 Sedan
2003-2007 Infiniti G35 Coupe
2006-2012 Infiniti G37 Sedan
2008-2012 Infiniti G37 Coupe
2002-2004 Infiniti I35
2004-2012 Infiniti M
2002-2006 Infiniti Q45
2002-2003 Infiniti QX4
2004-2012 Infiniti QX56
Infiniti Factory Service Bulletin OBDII Code P1273
When is the Code Detected?
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Frequently Asked Questions about P1273 Infiniti Code
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Discuss the causes and fixes for P1273 Infiniti OBDII Code
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I will like to know does Bank 1 means (upstream or downstream left and right) cos am having thesame issue with my mum infinite FX 2005 too and its says Air Flow System Sensor Failure Bank 1
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What does bank mean: https://www.autocodes.com/a...
Do you have an FX45 or FX35?
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I HAVE THE SAME FX35 HAVING SAME ISSUE
CAN YOU HELP PLEASE?smoke tested no leaks except waay in the back after both sensors from muffler
new spark plugs and new a/f sensor
car runs smooth though -
If you already replaced the A/F sensor and there are no leaks, then the next step is to clean or replace the Mass Air Flow (MAF) sensor.
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