How To Test O2 Sensor Heater

Take your resistance reading and compare it to the specification in your manual.

How to test o2 sensor heater. Making sure the o2 sensors heater is getting 12 volts the very first thing that were going to do is to make sure that the o2 sensors heater is getting 10 to 12 volts dc. Always use jack stands to support the vehicle. Fuse 5 is a 15 amp fuse. When the codes indicate a problem with the oxygen sensor heater that narrows the possibilities quite a bit.

Links to tools and. The light bulb draws about 175a at 12v. The o2 sensor heater is the component inside the oxygen sensor responsible for heating the sensor up more quickly. When testing the o 2 sensors heater circuit i found using a 7440 incandescent light bulb and socket very helpful.

Test 1 testing for 12v to oxygen heater first step. When the check engine light is on and the scan tool displays oxygen sensor codes you already suspect that the real problem might be something other than the oxygen sensor. In this video i will show how to test a oxygen sensor heater control with a multi meter. These 12 volts come from the fuse 5 of the battery junction box underhood fuserelay box.

Turn the voltmeter on and set it to the 1 volt scale. The voltage of the o2 sensor will fluctuate between 100 and 1000 millivolts which is 01 and 10 volts so having a quality volt meter is important. Here is a quick video i made on how you can test an oxygen sensor and also what different types of sensors are out there and whats the job of each wire on these sensors. You connect the light to the vehicles o 2 sensor heater harness in place of the sensor.

This is usually within the operating range of the sensors heater. O2 sensor heater circuit fault chevy s10 this applies to many makes and models duration.