P0301 troubleshooting

Tiny
ANITA KNAPP
  • MEMBER
  • 2017 HYUNDAI ELANTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 56,860 MILES
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?
Monday, June 3rd, 2019 AT 10:09 AM

2 Replies

Tiny
SCGRANTURISMO
  • 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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Monday, June 3rd, 2019 AT 6:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,101 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.
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Tuesday, June 4th, 2019 AT 5:24 PM

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