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Injector circuit open, cylinder 1. Check the connection at the #1 fuel injector if it is okay you may have a failed injector.
1: Replace the injector. 2: If still misfiring, replace the engine.
There are numerous things that can cause a misfire, see related questions below.
Spark plug, wire, coil, low compression, fuel injector, intake leak, etc.
The engine cylinder locations are numbered : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front I'm not a mechanic / technician but your misfire could be caused by a bad sparkplug , bad coil , fuel injector not allowing the proper air / fuel ratio , and maybe there are other causes of your misfire
PO301 means you have a cylinder misfire in the # 1 cylinder. Can be defective spark plug or plug wire. Can also be a defective fuel injector on that cylinder.
get a new 1 eg a holden
P301 is cylinder 1 misfire. The easiest fix is replacing the spark plugs, but the problem could also be cause by a burned valve or a malfunctioning injector.
Find out why it is missing. Bad plug, plug wire, injector, etc. if its not plugs wires or coil it could be ignition modular its under the coil packets
Start with the basics, inspect the condition of the:sparkplug(s)sparkplug wire(s)fuel injector - fuel intake systemSee "Related Questions" below
Misfire Answer Faulty: spark plug, spark plug wire, ignition coil, ignition module, fuel injector are the most common. Coolant leaking into a cylinder is another. Internal engine problems such as burnt valve, broken valve spring, bent push rod, worn rings
It means that more than one cylinder has a misfire history. PO301 would be cylinder number 1 misfire. PO302 would be number 3 cylinder misfire.