What causes P0030 code?

Here are some of the possible triggers of code P0030: Faulty oxygen sensor. An issue with the oxygen sensor heater circuit, such as a blown fuse, damaged wires or poor connections. An issue with the PCM, such as software in need of an update.

What can cause a P0036 code?

If you’re wondering why your OBD-II sensor is giving you a P0036 code, it could be one of these causes: A faulty oxygen sensor (a healthy heater usually measures about 6 ohms) A problem with the O2 sensor heater control circuit, such as damaged wires or poor connections.