Live data, all 4 o2 sensors have no voltage change. - Nissan Forum
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post #1 of 3 Old Oct 6th, 2018, 06:58 PM Thread Starter
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As title says no voltage change in all 4 sensors at warm Idle. ((Side note this first video @idle was recorded right after the second video. I shut the engine and it struggled to crank, the short fuel trim went from normal range to over 20))


While at 2500 rpms upstream holds steady and downstream fluctuates.


Both these situations are the opposite of everything I've read online. Anyone have any clue on what I should do? Oh and yeah p0420

Last edited by Cory Thomas; Oct 6th, 2018 at 07:01 PM.
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post #2 of 3 Old Oct 7th, 2018, 10:21 AM
Sup Mod keeping the peace
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You may have a problem with the charging system. A properly working charging system puts out about 13.2 to 15.0 volts, but this is a general spec. and the factory service manual should be referenced for the correct charging system voltage specifications for a particular vehicle. A battery should have a static charge of 12.2-12.6 volts. If a battery is not good, the charging system may not be able to charge properly. If a vehicle is not charging properly and the battery is good, the first thing to do is to turn the ignition switch to the "ON" position without starting the engine and make sure the charging system warning light is operating.

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post #3 of 3 Old Oct 8th, 2018, 05:11 PM
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o2 sensors

fuel/air sensors which replaced o2 sensors read opposite and have a constant 3.3 volts---but I don't know what your car has
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  Nissan Forum > Altima/Stanza > L31 2002 - 2006

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