Engine-CodesInfiniti – P1271 Infiniti

P1271 Infiniti Code - Air Fuel Ratio Sensor 1 Bank 1 Circuit No Activity Detected

Quick Answer

The P1271 Infiniti code indicates that there is no activity detected in the circuit for Air Fuel Ratio Sensor 1 Bank 1. Common causes include Faulty Air Fuel Ratio Sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning ECM. 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
P1271 Infiniti indicates Air Fuel Ratio Sensor 1 Bank 1 Circuit No Activity Detected.
Common causes
Common causes include Faulty Air Fuel Ratio Sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning ECM.
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.
Table of contents Created and updated by William Orellana on Sep 10, 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 P1271 Infiniti Description

The P1271 Infiniti code indicates that there is no activity detected in the circuit for Air Fuel Ratio Sensor 1 Bank 1. This sensor plays a crucial role in monitoring the air-fuel mixture being sent to the engine for combustion. The sensor detects the oxygen content in the exhaust gases and sends this information to the engine control module (ECM), which then adjusts the air-fuel ratio for optimal combustion efficiency.

OBDII Code P1271 Infiniti - Air Fuel Ratio Sensor 1 Bank 1 Circuit No Activity Detected
P1271 Infiniti Code - Air Fuel Ratio Sensor 1 Bank 1 Circuit No Activity Detected

Common Causes of P1271 Infiniti

  1. Faulty Air Fuel Ratio Sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Malfunctioning ECM
  4. Vacuum leak in the intake system
  5. Exhaust system leaks or restrictions

Symptoms of P1271 Infiniti

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Hesitation or lack of acceleration
  4. Increased emissions
  5. Check Engine Light illuminated

How to Fix P1271 Infiniti

  1. Diagnose the issue using a scan tool to confirm the P1271 code and pinpoint the exact cause of the problem.
  2. Inspect the Air Fuel Ratio Sensor, wiring, and connectors for any signs of damage or corrosion.
  3. Test the sensor's functionality using a multimeter to check for proper voltage and resistance.
  4. Replace the Air Fuel Ratio Sensor if it is found to be faulty, ensuring proper installation and calibration.
  5. Clear the code from the ECM memory and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1271 Infiniti

The typical repair costs for addressing the P1271 Infiniti code can vary depending on the specific cause of the issue. In general, replacing the Air Fuel Ratio Sensor can range from $200 to $500, including parts and labor. Additional costs may apply if wiring or connectors need to be repaired or replaced. It is recommended to consult with a professional mechanic or dealership for an accurate cost estimate based on the vehicle's make and model. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to inquire about these factors when seeking repairs.

When is the Code Detected?

The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 0V.

Need more information about the P1271 Infiniti code?

Need more information on how to fix the P1271 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1271 Infiniti 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 P1271 Infiniti Code

No Frequently Asked Questions about P1271 Infiniti Code found.

Discuss the causes and fixes for P1271 Infiniti OBDII Code

Code P1271 Infiniti comments

No comments found for this page.