P1289 INFINITI, NISSAN: AIR FUEL RATIO SENSOR 1 CIRCUIT SLOW RESPONSE BANK 2
POST UPDATED IN February, 2023
P1289 INFINITI, NISSAN: AIR FUEL RATIO SENSOR 1 CIRCUIT SLOW RESPONSE BANK 2
The A/F Sensors are installed in the exhaust system to measure the amount of oxygen present in the exhaust accurately. The readings collected by these sensors are sent to the ECM (Engine Control Module). Then, it will adjust the air/fuel mixture parameters as necessary to make the mixture as stoichiometric as possible.
Inside the Air/Fuel Ratio Sensor is a heater. When it is activated, the time it takes for the sensor to reach a temperature necessary to detect oxygen faster decreases. However, if you compare the conventional oxygen sensors to the A/F sensors, the A/F sensors provide a wider range of accurate readings. These electrical signals are clear and continuous over the range of (0.7 < λ < air).
The P1289 OBDII fault code P1289 is a code used by Infiniti and Nissan brand manufacturers to indicate that the rich-to-lean response of the A/F signal calculated by the ECM via the Air/Fuel Ratio Sensor 1 has taken longer than the allowed time.
Reasons to set the DTC P1289 OBD2 DTC code:
To troubleshoot the P1289 OBDII diagnostic code, consider this: