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P1278 2004 NISSAN MAXIMA

P1278 2004 NISSAN MAXIMA - Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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P1278 2004 NISSAN MAXIMA Possible Causes

  • Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
  • Air fuel ratio (A/F) Sensor 1 Bank 1 Harness or connectors is open or shorted
  • Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
  • Fuel pressure
  • Faulty Fuel injector
  • Intake air leaks
  • Exhaust Gas leaks
  • Faulty PVC
  • Faulty Air Flow Meter

First diagnose P1278 2004 NISSAN MAXIMA 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 terminals.

Cost of diagnosing the P1278 2004 NISSAN MAXIMA code

    Labor: 1.0

    The cost of diagnosing the P1278 2004 NISSAN MAXIMA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the P1278 2004 NISSAN MAXIMA code detected?

The response (from RICH to LEAN) of the A/F signal computed by ECM from A/F sensor 1 signal takes more than the specified time.

P1278 2004 NISSAN MAXIMA Possible Symptoms

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

P1278 2004 Nissan Maxima Description

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).

OBDII Code P1278 2004 Nissan Maxima - Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response - AutoCodes.com

P1278 2004 NISSAN MAXIMA More Information

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