Engine-Codes - Nissan - P1276 2003 NISSAN SENTRA

P1276 2003 NISSAN SENTRA - Air Fuel Ratio Sensor 1 Bank 1 Circuit High Voltage Detected

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1276 2003 NISSAN SENTRA Possible Causes

  • Faulty air fuel ratio (A/F) sensor 1 heater Bank 1
  • Air fuel ratio (A/F) harness is open or shorted
  • Air fuel ratio (A/F) circuit poor electrical connection

How is the P1276 2003 NISSAN SENTRA code repair?

Start by checking 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.

What is the cost to diagnose the P1276 2003 NISSAN SENTRA code

Labor: 1.0

The cost to diagnose the P1276 2003 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.
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When is the code detected?

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

Possible Symptoms

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

P1276 2003 NISSAN SENTRA Meaning

The 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).

More Information

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