Check engine light code (misfire)

2002 NISSAN ALTIMA
138,000 MILES • 2.5L • 4 CYL • 2WD
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DANIEL BEBEE
  • MEMBER
  • 3 POSTS
Read a code for misfire. Replaced spark plugs, coil packs, 02 sensors, and valve cover gasket. Then I cleared the code. Code came back and now computer is unable to connect to my car. Literally says can't connect error.
May 23, 2021 at 10:53 AM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
This could be a couple things. Here is a guide that will get us started:

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

However, we really need to see what the o2 sensors are reading to see if they are rich or lean. This will tell us what the issue could be. So I would suggest stopping by a parts store and see if their tool can communicate with it. This may be an issue with your tool or a greater issue.

Then we need to run a compression check and swap the injector that is on the cylinder that is misfiring to another cylinder and see if the misfire moves to this cylinder.

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

Let's start with this info and go from there. Thanks
May 24, 2021 at 9:02 AM
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