P1283 - FAULT CODE - OBD2

P1283 INFINITI, NISSAN: AIR-FUEL RATIO SENSOR 1 LEAN SHIFT MONITORING BANK 2

The Air/Fuel Ratio Sensor (A/F Sensor) is a device that is installed in the exhaust and its function is to take measurements of the oxygen present in the exhaust system where it is installed, and then transmit this data to the Engine Control Module (ECM). This controller, upon receiving the aforementioned information, uses it to regulate the parameters of the fuel mixture, in order to keep it within the stoichiometric range.

The A/F Sensor has a heating element, which helps the sensor reach a temperature of 700 – 800°C (1,292 – 1,472°F), and it is through these that it ensures proper operation and faster oxygen detection. The readings provided by the Air/Fuel Ratio Sensor are accurate and continuous over a wide λ range (0.7 <λ <air).

The P1283 OBDII fault code is set on Nissan and Infiniti vehicles when the ECM calculated output voltage of the Air/Fuel Ratio Sensor number 1 signal from bank 2 shifts to the lean side over a certain time.

• Check Engine lamp illuminates.
• Irregular engine operation during idling.

P1283 OBD2 diagnostic code is stored for one of the following reasons:

• The Air Fuel Ratio Sensor 1 harness on bank 2 could have been damaged.
• The fuel pressure could be out of proper levels.
• A fuel injector could be faulty.
• Air/Fuel Ratio Sensor 1 may be defective.
• Intake air may be leaking.
• The airflow meter could be in poor condition.

The steps to follow to correct the DTC P1283 OBDII code are as follows:

• Consult the TSBs.
• Using a scan tool, check if other fault codes are set. If these are related to exhaust system problems, diagnose them before P1283.
• Check the electrical components of the Air/Fuel Ratio Sensor 1 circuit for common deficiencies. If you discover wear or burns, proceed with repairs.
• Measure the fuel pressure and compare that value to the manufacturer's specification. If you discover an out-of-range value, it is necessary to check the fuel injectors for good condition. Repair or replace as required.
• Check for intake air leaks. If you discover such inconsistencies, make the appropriate repairs.
• Using the appropriate tools, check if the resistance of the A/F Sensor 1 matches the manufacturer's specifications. If a different value is found, replace the sensor.