99se5speed

iTrader: (8)

So for some reason my o2 keeps going off for Bank 2 Sensor 2 (High voltage). That's in the front header, I didn't touch it in any way. I only replaced the y-pipe and cat. I was expecting a code for maybe the ones in the y-pipe or somewhere in the back not in the header...anyway i replaced that sensor which was blue with a black 3 wire OEM plug. It's not the same length but it's the same o2. I still keep getting that code. I reset it, drive about 80-100 miles and it comes back, but it's not always 80-100 i drove about 3-400 before it triggered again today. What's up with that?

Trajiksmax

I once had the same problem after installing my Y-pipe. I replaced it w/ an OEM O2 sensor and the code returned about a month later. I reset it thinking it was just a glitch cause it was almost brand new. After about two monthes the same code returned. I ended up taking a gamble and going with a Denso Sensor, haven't had any problems since. Just wondering what brand sensor did you use?

max9900

hey guys.
the administrator wont let me start a new thread so this question is off topic.
the imobilizer in my 99 maxima is cutting power to the fuel pump so i was wondering if i could hot wire the fuel pump to toggle switch on the dash that is if the fuel pump recieves a constant 12 volts. also does the imobilizer effect anything else.

sorry again for the location of my post.

99se5speed

iTrader: (8)

^I think you HAVE to get your ecu and keys reprogrammed. I believe there's no other way. But you can do that fuel pump thing when the immobilizer is fixed. Not to sure.

o2 is OEM Bosch.

tavarish

iTrader: (27)

see if some of the plastic is stripped on the wire, it happened to me.

99se5speed

iTrader: (8)

Totally new sensor, it's just not the same color or length but it had the same 3 wires. I left the old o2 just in case...I think I'll stop by soon Freddy I'd like you to diagnose this bish!!!

tavarish

iTrader: (27)

no prob man.

njmaxseltd

iTrader: (19)

What is the error code number your getting?
It's possible you have replaced the wrong sensor on your 99.

motocross416

iTrader: (6)

I had a problem where I replaced my rear o2 and the code kept coming back just like you. Turns out the new 02 sensor I got was defective. Put a new one in and haven't had any problems since then

mindlessoath

iTrader: (1)

i too, have been having issues where the sensor will go off in the same fashon as yours.

i havent replaced it at all, but it happend some time after the y-pipe replaced.

mabe it could be the brand? i havent replaced the actaull sensor, but when i do, i plan to go with denso - like noted above. anyone remember the site to buy the o2 sensors? i forget what it was called again - i bought a rear o2 sensor but never installed it, i havent got the recipt anymore.

Trajiksmax

This is the Denso Site:http://densoaftermarket.com/catalog/...N&model=MAXIMA I hope this will help you reference you 1997 O2 sensor. I personlally have had no problems with Denso products. I highly recommend their O2 sensor.

99se5speed

iTrader: (8)

I forgot the code i'll look for it later, i checked it myself with autozone's obd-2 and it said i believe not to sure P0158 Bank 2 Sensor 2 (High voltage)

nismos14

iTrader: (56)

Might be the cat going bad. I got an o2 code ALOT, replaced it, and it would sometimes come back, replaced the cat with a high flo someone traded me, problem solved.

99se5speed

iTrader: (8)

I'm more then possitive it's not the cat since that's been replaced with a Cattman Fast Cat during the install of the y-pipe. The thing is the sensor that keeps reading bad is the one in the manifold...I haven't even messed with my manifolds so that's why I have no idea wtf is up.

Unless i'm an idiot and i changed the wrong sensor...which it turns out i did
http://www.jatan.net/02Sensor1.jpg Changed the Blue one had to change the red...

jasonv

iTrader: (2)

bank 2 = 2nd bank = cylinders 2,4,6

sensor 2 = 2nd sensor = the one after the one on the header. i never looked under there but is it before or after the cat?

99se5speed

iTrader: (8)

Check the link i posted up top...

mindlessoath

iTrader: (1)

the rear o2 sensor i belive tells you if the cat is bad or not, im not 100% on this, but it sounds like what i was told by a nissan dealership guy.