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P0301 and P0306 codes

Tiny
JEEPSEDGE
  • MEMBER
  • 2001 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 188,000 MILES
Initially we had a code that said the o2 sensor was bad. Drove for a couple of weeks now the two codes (301 and 306) come up but nobo2 sensor code. Could just changing the plugs and wires make the codes go away?
Friday, September 20th, 2019 AT 2:38 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

It may or may not.

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

I would check the compression to be sure the engine does not have an issue.

https://www.2carpros.com/articles/how-to-test-engine-compression

I would also check the fuel pressure. Low fuel pressure will cause misfires as well.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Friday, September 20th, 2019 AT 3:10 PM

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