Code P400 I have a 1996 Nissan Sentra GXE and I am getting a P400 code. I think it's something that has to do with emissions. Also, I notice that sometimes when I am accelerating 40 MPH or 45, it kinda does a minor stall or hesitatation and sometimes when I accelerate, the acceleration gets stuck on me. Thanks, Jean Llave Land O Lakes, FL

link on relay
https://www.justanswer.com/nissan/2sn3q-2003-nissan-sentra-gxe-relays-the-hood-compressor-push-button.html
two fuse boxes link
https://www.youtube.com/watch?v=yIB4rlYwpjo
owners manual 03 sentra
https://justgivemethedamnmanual.com/nissan/2003-nissan-sentra-owners-manual/
Hope something here can help you

Part 1 -How to Test the Ignition COP Coils (Nissan 1.8L)

troubleshootmyvehicle.com > Nissan > 1.8L

Feb 12, 2013 - What Tools Do I Need to Test the COP Coils. ... coils (most commonly known as the COP ignition coils), on your 1.8L Nissan Sentra is pretty easy. ... When one COP ignition coil fails... that cylinder goes 'dead' due to a lack of Spark and is said to be misfiring. .... 2000, 2001, 2002, 2003, 2004, 2005, 2006 ...

Part 2 -How to Troubleshoot a No Start (Nissan 1.8L)

troubleshootmyvehicle.com > Nissan > 1.8L

Jan 17, 2013 - Checking for Spark With a Spark Tester. ... Your 1.8L Nissan will either have a distributor-type ignition system or the more modern COP ... A BAD fuel pumpwill cause your 1.8L Nissan Sentra to Crank but Not Start... since the ... Still, the other method that I've used to test for a lack of fuel... is spraying starting ...

2002 Sentra 1.8, no spark, code 0505... - Nissan Sentra Forum ...

www.b15sentra.net > ... > Technical Discussion

Nov 4, 2008 - 15 posts - ‎3 authors
I have never had a problem with the car before (02 Sentra 1.8/auto), so I had no need to post ... Originally Posted by Black B15 ... Join Date: Jun 2005 ... Can you see if the coilpacks are getting spark & work back from there? how many spark plugs do i need ? - Nissan Sentra ...
7 posts
Mar 19, 2010
Spark Plug Replacement - 2002 GXE 1.8L - Nissan ...
15 posts
Oct 12, 2009
1.8s starting problems - Nissan Sentra Forum - B15 ...
15 posts
Jun 23, 2009
No start on 1.8L 02 GXE - Nissan Sentra Forum - B15 ...
15 posts
Apr 11, 2009
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The car may not recognized its key. I would try another key or see if there is a code for an unauthorized key.

If the car has a chip key, the ignition may not recognize the key. Try another key or read the trouble code and the chip reader may not be working.

It sounds like the transmission is slipping and the sensor is just reporting this info and setting a code, you have made a common mistake. You likely need a transmission overhaul

https://www.obd-codes.com/p0450

p1320 is a ignition primary signal code. you may need ignition coils. not a common issue on a 2000 sentra, but depending on milage you may need coils. unfortunatelly you dont have a specific cylinder number code stored such as p0301 which is number 1 cylinder misfire and so on in your case p0301 to p0304 because its a 4 cylinder vehicle. with the p1320 its usually the whole set of 4 coils.

ok the fuel pressure is very good , and you replace maf sensor too,
i think 2 probable throubles, one , the catalyc converter clogged , to check remove exhaust pipe section before catalyc and run engine, its very loudness, other is tps fault, tps is throttle position sensor, located on acceleration body

Distributer Signal Output is code p1320........Intake Valve Timing Control Position Sensor Bank1 is code p1140...

You will need a new catalytic convertor assembly. Yours is below treshold efficiency in other words its "no good".If you have it replaced, ask the garage/dealer to give you the old one back. Its worth some cash if its full. It doesn't matter thet it failed. They are going after the mesh inside of it and that is worth some $$$$. May not be much , but better than nothing.