I have a error code of P0138 on 2001 maxima

Check to make sure no wire harness connections were left unhooked. the 1217 error is the cooling fan and it relates to u0164 which is the computer can talk to the HVAC controller and this is usually a grounding issue. The 101 error is a MAF sensor

The heater control sensor is for the Oxygen sensor. If you modified the catalytic converter you have upset the balance of temperatures in the converter. The sensor thinks the oxygen sensor needs extra heat. If the heater control sensor fails, you'll get the code.

P0132 Nissan - Engine-Codes.com

engine-codes.com/p0132_nissan.html
P0132 Nissan O2 Sensor Circuit High Bank 1 Sensor 1. ... 2002 Nissan Sentra andAltima Factory Service Bulletin OBDII Code P0132 · What does this mean?

P1320 Primary Ignition Signal Fault Testing and ... - YouTube

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www.youtube.com/watch?v=kpFzunNeAaY
Aug 15, 2014 - Uploaded by CarsNToys This was performed on a 1997 Nissan Maxima. ... Code P1320 is indicated when ignition signal in the primary circuit (of the ... $1000 and could not find the problem out with my 2001 maxima.but now at ..... 2016 Nissan Maxima SL - Ultimate In-Depth Look - Duration: 43:16. by MikesCarInfo 261,066 views.

Well, sometimes you get lucky replacing parts, but usually its something other than the component in question.
The trouble codes are a guide as to what to test, not what to replace.
Code 325 is for the knock sensor which could be a phantom code.
Code 100 is for a bad signal from the MAF sensor which may or may not be caused by a bad sensor. It could be a vac leak too.
Code 110 is for a bad signal from the intake air temp sensor. The signal tells the computer what the temp of incoming air is to help the computer decide how rich the fuel mixture should be.
You need to get the testing procedures for each code and follow them. I would skip code 325 and start with code 110.
The fuel pump was probably a waste of money unless you checked fuel pressure before you replaced it and it was low. Same thing with the O2 sensors. Very rare if both sensors fail at the same time.

Always buy OEM sensors.

Take your car to your local Autozone and let them hook up an OBDII scanner up to read the error code. It will tell you what is causing the yellow light. They don't charge to do a reading for you.

around 300.00 -400.00 est. at dealer garage maybe little cheaper not much more

This code can be caused by all of the things you mentioned, plus a damaged parking pawl ring on the transmission. This is what the sensor reads. For my money, I'd try replacing the sensor. They are relatively cheap compared to the alternatives and Nissan sensors have a reputation for early failure.

Hope this helps,
Dave

you need to replace the o2 sensors

The knock sensor error could be the sensor, sensor circuit, or some misfire caused by a dirty/bad injector or some ignition problem.

One issue that might tie it all together is coolant leak causing the misfire/knock like a head gasket, but I think you would be throwing more codes or you would see more problems than what you have.