Engine codes

Question

I have 2 engine codes 1-O2 heater circuit bank 1 sensor 1 and
2. P0300 Engine Misfire detected
After looking around at codes and issues I read a service bulletin about my car having issues with clogged fuel injectors. Would that cause both codes too display at the same time and is that the best place too start or should i do other checks first.

Answer 1

Hi there

I would start by checking for the cause of the misfire. Check the plug wires, ignition coil and plugs to begin with. Fuel injectors could cause the P0300 as well. The heater circuit on the O2 sensor is not affected by the misfires so it's likely a problem with the sensor itself.