2010 Mazda 5 How to Troubleshoot Oxygen Sensor

ID: 153096

Description: One year after replacing the rear oxygen sensor...

Steps:

1. Check the fuse for the pre-heating of the oxygen sensor (in this case #37)

2. Unplug the sensor and decide on a numbering scheme. Also clean the pins to ensure this is not a connection problem

3. Check all combinations of the pins of problematic sensor. See comparison chart above (with the new replacement sensor).
4. If you do not have such a tester, a normal multimeter (resistance and capacitance) should be sufficient
5. If you would like a transistor tester, you can search Aliexpress for one. It is an amasing little device. https://www.aliexpress.com/item/10050015...