P1286 code possible causes
- Faulty Air/Fuel Ratio (A/F) Sensor 1 Heater Bank 2
- Air-Fuel Ratio (A/F) circuit wiring open or shorted
- Poor electrical connection in Air-Fuel Ratio (A/F) circuit
How is P1286 code repair performed?
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 pins.
What are the possible symptoms of P1286 code?
- Check Engine Light On (or Service Engine Soon Warning Light)
What does P1286 code 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 in 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, 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 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 exhaust gas composition 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).