AutoCodes - Nissan - P1273 2002 NISSAN SENTRA

P1273 2002 NISSAN SENTRA Code - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3
Table of contents

|P1273 2002 NISSAN SENTRA code possible causes

  • 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 do I fix the P1273 2002 NISSAN SENTRA code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P1273 2002 NISSAN SENTRA code tech notes

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

There is a factory service bulletin for the 2002 Nissan Sentra:
2002 Nissan Sentra Factory Service Bulletin OBDII Code P1273





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|Cost of diagnosing the P1273 2002 NISSAN SENTRA code

Labor: 1.0

The cost of diagnosing the P1273 2002 NISSAN SENTRA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P1273 2002 NISSAN SENTRA 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.

|What are P1273 2002 NISSAN SENTRA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible rough engine idle

|P1273 2002 NISSAN SENTRA code description

The Air Fuel Ratio (A/F) sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.
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).
OBDII Code P1273 2002 Nissan Sentra - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring - AutoCodes.com

|Need more information with the P1273 2002 NISSAN SENTRA code?

Need more information on how to fix the P1273 2002 NISSAN SENTRA code? Get Access to Factory Service Manuals

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|P1273 2002 NISSAN SENTRA code comments

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