Question about 1995 Nissan Maxima

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Was told need to replace oxygen sensor (code PO150,PO400,and PO32

Where is the oxygen sensor and how do I replace it ?

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  • Rachel Maher Jul 22, 2009

    they didnt say but the guy mentioned 2 other sensors besides the oxygen sensor. The "knock sensor" and " egr temprature sensor"

  • Mike Vincent
    Mike Vincent May 11, 2010

    did they tell which sensor it is? there are more then one.



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There are two sensors or more if it's a v 6 or v8 you have a post catalytic converter 02 sensor which is on the exhaust manifold and you have another after the catalytic converter they will be on the exhaust system in case your not sure what the exhaust system looks like, the 02 sensor looks like a spark plug it will have a quick disconnect that you have to unhook before you unscrew the sensor, 02 sensors will fail in three ways the heater burns out or the sensor gets lazy and does not cycle fast enough for the computer or gets fowled out by carbon and does not read at all, most of the time it's the sensor before the catalytic converter or on the exhaust manifold you will need to buy a special 02 sensor socket to remove it. It has a slot for the wires in it and will allow the socket to let the wires hang to one side the socket costa about $20.00 at any parts store if you have a schucks or autozone you can go there and ask them to test your car and it's free they can pull the code and tell you which one it is and point it out to you and you can buy the sensor from them once it is replaced the light will go off by itself, a heated 02 sensor costs on average $40.00 may be more or less not including sales tax.

Posted on May 28, 2009


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MIL on

Actually the PO139 is Downstream O2 sensor slow to respond, And PO400 is EGR flow malfunction. But any why it sounds like the problem is in the exhaust system. I would start by checking the EGR valve first. Make sure the vacuum is operating it properly. If it is not that would make the O2 sensor slow to read or give the emissions system problems with oxygen readings. Good luck and have a good day.

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EGR Flow and Knock sensor 1


The EGR valve allows a percentage of exhaust gas back into the engine during part throttle driving conditions. The exhaust gas enters the combustion process and cools the charge down slightly which lowers the emissions.

The EGR flow malfunction is usually rectified by removing the EGR valve and cleaning out the valve itself and the port(s) on the intake where it was sat, which have probably become narrowed due to all the deposits. You need to use a piece of wire to get right into the ports and clean them right out. The valve is connected to both the intake manifold and the exhaust, it is round and will have a vacuum pipe to it. It will either be mounted directly on the intake manifold, or linked to it via a hose, probably metal, and it will be linked to the exhaust via a hose, probably metal.

The knock sensor listens for engine knock, usually caused by incomplete combustion or over advanced ignition timing, and retards the ignition timing to counteract the knock.

You very highly likely have a faulty sensor, but check the wiring first. To suss the problem properly you would need to have alive scan carried out.

Knock sensors are usually located under the intake manifold on these cars and are a complete pain to get to. You'll probably need a universal joint type of affair to get it off. They held on with one bolt.

Very best regards


Jun 13, 2008 | 1996 Nissan Maxima

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