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Forums Nissan Models Altima 2005 2.5 Altima o2 sensors, how many?
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Old 12-09-2011, 05:55 AM
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Default 2005 2.5 Altima o2 sensors, how many?

How many sensors are there? Does the precat have 1 or 2? I thought it had 2 on it? I am trying to price out o2 sensors for the car and see upstream and downstream. I thought the precat has 2 sensors in it, and the pictures I have seen of the precat show 2 bungs. Is one plugged? I think there is 1 under the car for the main cat. Am I missing any? Thanks.

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Old 12-09-2011, 10:51 AM
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As far as I know it has only 2 sensor. Here is an image from the service manual.

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