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05 Sentra

Tiny
DFRANQ
  • MEMBER
  • 2005 NISSAN SENTRA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
I have an 2005 sentra 1.8L with 100,000 miles. Recently, it started idleling ruff only in the morning and when its cold. The car's computer gives a PO300. I replaced the spark plugs, cam sensor, and exchanged coils on all four pistons but the car still idles bad. The car does not return a complete O2 test cycle. If it was the O2 sensor wouldnt the car specify specificlly that code. Can you please direct me in the right direction?
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Tuesday, December 7th, 2010 AT 3:53 PM

1 Reply

Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Yes it may or may not throw a code for the o2 sensor, depending on how bad it is, if its just a little "lazy" then it wont. But po300 is multiple misfire, can mean some other things too. Like a leaking intake manifold gasket, a filthy air filter can do it, a bad or dirty egr valve will do it. Even a bad pcv valve, check these items first. Starting with the airfilter, then pcv valve
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Tuesday, December 7th, 2010 AT 8:15 PM

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