O2 Sensor Heater Fuse Location – Here’s How To Find It!

O2 Sensor Heater Fuse Location

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 Fuse is responsible for heating the oxygen sensor in the exhaust system. By heating, 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 Oxygen sensor heater fuse is located on your vehicle. 

Why the O2 Heater Fuse May Blow

There are various explanations for why a fuse for the O2 sensor heater might blow. One of the primary reasons is a malfunctioning sensor. As it ages, it may wear out or become damaged, resulting in it drawing more energy than normal. This extra power can cause the fuse to become overwhelmed and blow.

An additional explanation for a blown fuse could be linked to issues with the wiring. As time passes, the wiring that connects it to the vehicle’s electrical system may undergo damage or corrosion, resulting in a short circuit that can overwhelm and blow the fuse as well.

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. 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. 

Related Post: How To Bypass O2 Sensor Heater Circuit: (Resistor Bypass)


To sum up, the location of the Oxygen sensor heater fuse may differ depending on the car’s brand and model. It is imperative to ensure that the appropriate fuse of the correct size is used. It is also recommended to seek the guidance of a certified mechanic or refer to your vehicle’s owner’s manual before attempting any repair or replacement of auto parts.

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