An oxygen sensor is a device that measures the concentration of oxygen in the exhaust gases of an internal combustion engine. The oxygen sensor provides a feedback signal to the engine control unit (ECU) that indicates the amount of oxygen in the exhaust gas. The ECU then adjusts the air/fuel mixture to optimize the combustion process and reduce emissions.
The O2 Sensor Heater is responsible for heating the oxygen sensor in the exhaust system. By heating the sensor, it allows the sensor to measure the amount of oxygen in the exhaust system more. If this fuse were to fail, the oxygen sensor would not be able to heat up and would not function properly. This could lead to inaccurate measurements of the amount of oxygen in the exhaust and could cause the engine to run inefficiently.
This article will show you where the O2 sensor heater fuse is located on your vehicle.
O2 Sensor Heater Fuse Location
The oxygen sensor provides no voltage to the computer in cold weather (until the car is started), which is why a heater is used to warm up the sensor. Most car models with OBD-II have heated oxygen sensors. A warmed oxygen sensor has its own circuit for heating, which is usually powered by a separate circuit. This heater usually has its own wiring circuit. Oxygen sensors with heaters are usually equipped with 3 or 4 wires.
The position of the oxygen sensor fuse may vary from model to model car. In front of the exhaust system is a Heated Oxygen Sensor. It’s a component of the Oxygen Sensor Heater system.
It may be under the driver’s side dashboard in the passenger compartment for some automobiles or is located in the fuse box under the hood in the engine compartment labeled with different names according to the make and model. Usually, the fuse is rated from 15 to 30 amps.
The Powertrain Control Module turns the heater strip circuit on and off for each sensor during oxygen sensor heater monitoring and checks for a predicted change in current. The Powertrain Control Module continuously checks current flow through the heater circuit on some OBD II systems. Each oxygen sensor’s heater circuit is assessed separately.