P1289 NISSAN MAXIMA code possible causes
- Faulty Air-Fuel Ratio (A/F) Sensor 1, Bank 2
- Air-Fuel Ratio (A/F) Sensor 1 Bank 2 harness is open or shorted
- Air-Fuel Ratio (A/F) Sensor 1 Bank 2 circuit poor electrical connection
- Low fuel pressure
- Faulty fuel injector
- Intake air leaks
- Exhaust gas leaks
- Faulty PCV
- Faulty mass air flow meter
How is P1289 NISSAN MAXIMA 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.
When is P1289 NISSAN MAXIMA code detected?
The response (from RICH to LEAN) of the A/F signal calculated by the ECM from the A/F sensor 1 signal takes longer than the specified time.
What are the possible symptoms of P1289 NISSAN MAXIMA code?
- Engine Light On (or Service Engine Soon Warning Light)
- Possible rough engine idle
What does P1289 NISSAN MAXIMA code mean?
The A/F sensor is a planar dual-cell limit current sensor. The A/F sensor element combines a Nernst concentration cell (sensor cell) with an oxygen pump cell, which transports ions. It has a heater in the element.
The sensor can precisely measure λ=1, but also in the lean and rich ranges. With its control electronics, the sensor delivers a clear, continuous signal across a wide λ range (0.7 < λ < air).
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 λ=1. Therefore, the A/F sensor can indicate the air/fuel ratio through this pumping current. Additionally, a heater is built into the sensor to ensure the required operating temperature of 700 to 800°C (1,292 to 1,472°F).