P0301 and P0306 codes

2001 JEEP WRANGLER
188,000 MILES • 6 CYL • 4WD • AUTOMATIC
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JEEPSEDGE
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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?
Sep 20, 2019 at 2:38 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
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
Sep 20, 2019 at 3:10 PM
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