P0301 troubleshooting

2017 HYUNDAI ELANTRA

56,860 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC

ANITA KNAPP

MEMBER
1 POST

So a few days ago I had a check engine light come on in my car and the code was P0301. I was told to do a fuel system cleaner or fuel injector cleaner so I did that. Yesterday the light came back on briefly and then disappeared again there has been a sputter in the idle occasionally. So last night I change the spark plugs and now it’s running ten times worse. Any ideas of what to do from here? Or what did I do wrong yesterday?

Jun 3, 2019 at 10:09 AM

SCGRANTURISMO

✓ASE Certified Mechanic
4,897 POSTS

Hello

P0301 is an Automotive of Service Excellence (ASE) or "generic" Direct Trouble Code (DTC) for a misfire in cylinder #1. It can be caused by many things. In the diagrams down below I have included a inspection guide from the vehicle manufacturer for DTC P0301. Please go through this guide and get back to us with what you are able to find out.

Thanks,
Alex
2Carpros

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Jun 3, 2019 at 6:53 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

Hello,

This guide can help as well:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please run down this guide and report back.

Jun 4, 2019 at 5:24 PM