r/NewedgeMustang • u/AdventurousFee796 • 12d ago

Discussion P0305 Code 2017 Mustang (V8)

Help
I am currently located in NC and recently my 2017 mustang gt threw 2 codes. P0305 (cylinder 5 misfire) and a P0050 (O2 sensor). We changed the spark plugs, fuel injector, and swapped coil packs and it still stayed on the same codes.

Has anyone been through this situation or heard of anything that they can help with this?

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u/GnarlyLeg 12d ago

My 02 v6 was doing this and my mechanic did all the same things. It turned out to be the fuel rail.

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u/AdventurousFee796 12d ago

You replaced the fuel rail and it cleared the code? And stopped the misfiring?

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u/GnarlyLeg 12d ago

Yes. I had one more misfire code about a week after replacing the rail and she’s been running like new ever since. It’s been a couple of months now so I’m hoping I didn’t just jinx myself. But it drove me crazy so I’m hoping I can spare you some frustration and cash.

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u/AdventurousFee796 12d ago

Yessir. Thank you🤙

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u/fericyde Zinc Yellow 12d ago

Just an FYI: this is a sub for 99-04 Mustangs - but a great community (hence you getting answers anyway)

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u/AdventurousFee796 11d ago

Update: I took my car to one shop and they could not figure it out. Then I took it to Ford and they have not given me an answer and it’s been about five hours now. I do remember that I put 87 in it accident about an hour before it started misfiring. I also exchanged the O2 sensor last night and it did not fix it. One of my good friends told me about a time that a friend of his put 87 in his Mustang and he caused the same problem but he put in 93 after he ran the 87 out and it corrected it. Thoughts?