I have two engine error codes: P0147 and P0300.
Greetings! The P0147 is an oxygen sensor heater circuit failure, while the P0300 is a random multiple misfire. It is unlikely that these are related, although misfires do have an effect on oxygen sensors. The heater on the oxygen sensor is a device used to bring the sensor up to operating temperature faster than just by using the hot exhaust gases. The readings become more accurate at this point. The random misfiring can be an ignition system that is out of tune or that improper measurements were taken from faulted sensors. Have a mechanic, like the ones at YourMechanic, take a closer look at your concerns for a diagnosis of your engines error codes.
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