What kind of heater to use for O2 sensor?
When testing the O 2 sensor’s heater circuit, I found using a #7440 incandescent light bulb and socket very helpful. You connect the light to the vehicle’s O 2 sensor heater harness in place of the sensor. The light bulb draws about 1.75A at 12V.
How is the temperature of an oxygen sensor controlled?
The sensor is heated to about 1,200 degrees F (650 degrees C), double the temperature of a basic heated oxygen sensor. Sensor heaters can draw a lot of current, so battery voltage is usually supplied directly to the heaters through a relay and a fuse. The heaters’ ground circuit is controlled by the PCM.
How to set p0038 on oxygen sensor heater?
Input voltages in all oxygen sensor heater control circuits should be equal to battery voltage; deviations of 10% will also set code P0038 and trigger the CHECK ENGINE light. Note that the electrical resistance may differ on some applications- consult the manual on the exact values for the application being worked on.
Is there a problem with the oxygen sensor heater?
When the codes indicate a problem with the oxygen sensor heater, that narrows the possibilities quite a bit. However, if it’s Sensor 1, even if you determine the circuits and power supply are good, simply installing a new sensor isn’t a complete fix because the powertrain control module (PCM) won’t automatically work with the new sensor heater.
How is the heated oxygen sensor heater controlled?
The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
What does low code mean on O2 sensor heater?
7) Some cars the O2 sensor heater is pulse width modulated to control temperature. 8) An O2 heater circuit LOW code means circuit is below 0.3 Amps. A circuit HIGH means circuit current above 2 Amps. 9) There are three ways to test the O2 sensor heater, testing the ECM response, checking resistance, and checking current flow.
What kind of material is used in O2 sensor heater?
The O2 sensor is an older technology. 3) The O2 heater maintains a specific temperature at the O2 sensor. 4) Zirconius and Titania are the two types of O2 material. Zirconium being the most common one.
How many amps do you need for O2 sensor heater?
If O2 heater stays On, look for about 2 Amps. If O2 heater flickers, look for between 0.5 or half an Amp to 2 Amps. Remember that the ECM will shut Off the O2 heater circuit in the event of a malfunction, so you may need to erase codes. That’s it for the O2 sensor heater Quick-Fix.