I have a problem. The SES light is on and the code we (being myself and friend at a muffler/brake place with a GeniSys something LCD scan thing) pulled was PO105 MAP/baro circuit malfunction. They said it was probably due to the Frankencar intake I have, w/the Apexi filter. When we ran the scanner to monitor the MAF, it went from like 3 something to 18 and even 40 when we revved the engine. I believe it was monitoring cubic feet of air. (Sorry but if I knew more about this I probably would have had this fixed.) He said that it shouldn't be like that. Anyhow, the code comes back pretty much as soon as I turn the car on regardless if I cleared it. Also, I should probably mention that I changed the O2 sensors recently because they had a bad code as well and when I did that I changed the Spark Plugs with some bosch platinum 4s. Anyhow, I have to make a drive from New York to San Diego soon to change my duty station ( I'm enlisted in the Navy ) and I haven't a clue what that code really means and if I can make such a long drive with it on. Any sort of information would be really helpful. I have a 2k Max with 99600 or so miles on it .

Thanks!

 

That sensor really isn't critical...

According to the FSM, some things to try are:
A:
1)Turn ignition off.
2)Loosen and retighten engine ground screws(on top of engine next to oil filler cap).
B:
1)Disconnect absolute pressure sensor harness connector and check for water and or loose connection. It's attached to the ECU bracket located on the passenger side incabin floorboard behind the center console, ie below the center stack(radio, A/C controls, etc.).
C:
1)Turn ignition switch to "ON".
2)Check voltage between absolute pressure sensor terminal #1 and ground with multimeter. Terminal #1 of 3 is far right pin with connector on top facing you, ie 3x2x1. It should be ~5V. Use chasis metal(non-painted) for ground lead.
D:
1)Turn ignition switch "OFF".
2)Check continuity between terminal #3 and ground.

Just to get you started, but there are a few more.

 

I dont have my factory service manual with me now. but this might help:

http://forums.maxima.org/showthread....ighlight=P0105