P1051 INFINITI, NISSAN: AIR FUEL RATIO SENSOR 1 HEATER CONTROL CIRCUIT LOW BANK 2
POST UPDATED IN February, 2023
P1051 INFINITI, NISSAN: AIR FUEL RATIO SENSOR 1 HEATER CONTROL CIRCUIT LOW BANK 2
The fuel injection system of vehicles is based on conventional oxygen sensors. However, in the last few years, these sensors have given way to Air Fuel Ratio sensors (A/F), which offer higher accuracy.
An A/F sensor, also known as a “lambda sensor”, is installed in the exhaust manifold or the front exhaust pipe upstream of the catalytic converter. Its purpose is to measure the oxygen content of the exhaust over a wider range. Although similar in appearance to a conventional Oxygen Sensor, these sensors have more wires. The information collected by the Air-Fuel Ratio Sensor is sent to the ECM as a feedback signal, which will accordingly adjust the air-fuel ratio to keep it within its optimum level.
When the P1051 OBDII fault code is set, it is because after performing the ON/OFF service check of the Air-Fuel Ratio Sensor 1 heater, the current amperage was found to be out of range, resulting in an excessively low voltage signal being sent to the Engine Control Module.
The reasons for setting the P1051 OBD2 diagnostic code are:
The steps to troubleshoot the DTC P1051 OBDII code are as follows: