P1286 Code INFINITI Possible Causes
- Faulty Air/Fuel Ratio (A/F) Sensor 1 Bank 2
- Air/Fuel Ratio (A/F) Sensor 1 Bank 2 Circuit Open or Shorted
- Air/Fuel Ratio (A/F) Sensor 1 Bank 2 Circuit Poor Electrical Connection
How is INFINITI Code P1286 Repaired?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
When is INFINITI Code P1286 Detected?
The A/F signal calculated by the ECM from the A/F Sensor 1 signal is constantly around 0V.
What are the Possible Symptoms of INFINITI Code P1286?
- Check Engine Light On (or Service Engine Soon Warning Light)
- Possible Rough Engine Idle
What Does INFINITI Code P1286 Mean?
The A/F sensor is a planar dual-cell limit current sensor. The sensing 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 heating element within the element.
The sensor is capable of accurately measuring λ=1, but also in the lean and rich ranges. With its control electronics, the sensor outputs a clear and continuous signal over a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the oxygen pump electrode and the Nernst concentration cell, where they are brought to thermodynamic equilibrium.
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 =1. Therefore, the A/F sensor is able to indicate the air/fuel ratio by this pumping current. Additionally, a heating element is built into the sensor to ensure the required operating temperature of 700 to 800°C (1,292 to 1,472°F).