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Is this showing the downstream O2? Forums > > Is this showing the downstream O2? Is this showing the downstream O2?
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Old 10-19-2020, 03:45 PM
Scode68 Scode68 is offline
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Default Is this showing the downstream O2?

Is showing the down stream O2 isn't working? 2006 Altima 2.5L. I'm trying to track down this P2A00 code that pops up every other day.










I'm getting intermittent P2A00 codes which should be bank 1.

Last edited by Scode68; 11-07-2020 at 07:43 AM.
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Old 11-03-2020, 12:50 PM
Scode68 Scode68 is offline
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Anyone have a link on how to test the downstream O2 sensor?
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Old 11-04-2020, 04:11 PM
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smj999smj smj999smj is offline
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That info would be in the Nissan Factory Service Manual for your vehicle. Nico Club's website (google it) has free, online, Nissan service manuals at their site. The info would be in the Engine Control (or "EC") section of the manual.
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Old 11-04-2020, 04:33 PM
Scode68 Scode68 is offline
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Yeah, I have the manual downloaded but was wondering maybe there was a video or tutorial that someone did. Been working on cars for a long time but I'm not much of an electronics guy. Also waiting for some warmer weather this weekend and some more daylight since its dark now when I get home from work.

Both up and down stream sensors are new now but that doesn't mean one is bad.

Last edited by Scode68; 11-04-2020 at 04:35 PM.
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Old 11-07-2020, 07:36 AM
Scode68 Scode68 is offline
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so doing some checks on the downstream according to the manual.
  1. Continuity test between ECM terminal 25 and HO2S2 terminal 2 I should get something but I get nothing. Would the car even run if there was no continuity?
  2. Testing the new downstream O2 it says I should get 5.0-7.0 ohms at 77 degrees F. ts 66 out and Im only getting 3.5 ohms. Is this within reason or no good?
I am getting battery voltage #2 terminal of the O2 sensor 2. All the grounds I've checked so far are nice and clean.

Last edited by Scode68; 11-07-2020 at 07:41 AM.
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