I have Service engine light on for my nissan 2001 maxima. Dealer ran the diagnostics and said Bad o2 Sensor. Today , the Service engine light is gone.. Do I need to replace the part anyway or wait for the light to come back

Start buy replaceing the o2 sensor after the cat first o2 sensor if bad will give wrong reading i normaly tell the person lets try replaceing 2 o2 before spending 900 on a cat

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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.

I would look for a human holding a diagnostic analyzer to hook up to the car's interface to get the error
codes which point to the bad component or system. These people can be found at repair shops and dealer service departments.

renew the O2 sensors to start with and just hope that its a bad sensor on this bank they can break down prematurely .Luck of the draw their when buying new parts iam afraid your not the only one to buy new parts and have them go early .

It means that your engine is running lean - not getting enough fuel for the amount of air that the engine is receiving. Because your maxima is equipped with a V-6 engine, whatever the problem, it is affecting only bank #1. Bank #1 is always the side of the engine where cylinder #1 is located, or in your case, the left side of the engine as it is viewed while facing the crankshaft end of the engine.
(on a 4 cylinder engine, there is only one bank and it is always referred to as Bank #1)
There are several things that can cause a lean condition including vacuum leaks, a malfunctioning Evaporative Emissions system, a misfiring cylinder (due to bad plugs, bad injectors, or an intake or head gasket leak.), a malfunctioning Mass Airflow sensor (MAF) or Manifold Absolute Pressure sensor (MAP) or even a bad Oxygen sensor (O2s) (Nissan sometimes calls an O2s an "Air-Fuel Ratio Sensor") It is even possible for a leaking vacuum brake booster to cause a lean code.
If there are any other malfunction codes present, it may help to pinpiont the cause of the lean code. (Like a P0301 "cylinder#1 misfire detected", in which case, you would address the misfire code first.)
Certain problems, like a leaking brake booster or a bad MAF will usually set lean codes for BOTH banks.
If the P0171 is the ONLY code present, the most likely cause is a bad O2s, but I recommend some diagnostic testing to prove it before spending the mega-bucks that Nissan gets for their O2 sensors.

Heated oxygen sensor bank 1 sensor 2, what was the code numbers that came up?

it's located at the cylinder block (on the right or left)

code p 0138 refers to 2 items
1--heated oxygen sensor(HO2S) 2 bank 1--high voltage ==causes --wiring short to positive --HO2S---ECM
2--oxygen sensor (O2S) 2 bank 1--high voltage ===causes wiring short to positive ---ECM
code p 0139 refers to 2 items
1--- heated oxygen sensor (HO2S) 2 bank 1--slow response ===causes --heating inoperative --wiring--ECM
2--oxygen sensor (o2S) 2 bank 1 slow response ===causes --wiring --- O2S

heated oxygen sensors9HO2S) are in the exhaust manifold before the cat converter
Oxygen sensors (O2S) are after the cat converter
it is indicated that the HO2S is faulty-
check the wiring and /or replace both sensors

Dear Gandhi
1) You better check the 'Idle control relay' - and pray this is not your computer - who may be shorted ( The Computer that govern all elec. functions in the car - is also getting signals from your Mothor Mounts' to ensure a more balanced ride' If one or more of the Motor Mounts ( There are 3 ) are defective - they send a signal to the computer - and the yellow light ( Check engine soon) - will appear'
2) A Computer can only be fixed by a Nissan dealer ( est. $750 ) 3) The Idle control valve - can be adjusted too ( Again - by a Nissan Dealer only .
4) It is NOT an easy problem nor cheap . In short - your best bet is with the dealer - and ask them for a diagnostic ONLY ( est. $100 ) Don't tell the dealer what YOU think or did .......just tell them the 'Yellow light comes on' .......they'll take it from there.
Sorry I don't have better news today .

Best of luck
David

bank 1 refers to the side of the engine that #1 cylinder is on , and sensor 2 refers to downstream , after the catalytic converter. , this link shows bank 1 on a 2001 nissan maxima V6 being on the firewall side . if you had a 4 cylinder it would be downstream after the catalytic converter .

http://www.autozone.com/N,26200242/shopping/specsSelect.htm