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Old 04-24-2013, 09:45 AM   #1
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o2 sensor thread striped out in y-pipe

So i was attempting to change out my oxygen sensors this morning. I was able to remove/replace the o2 sensor in bank 2 but the one in bank one gave me problems.

Little did i know the oxygen sensor was really badly rusted on. I even tried soaking it with wd 40. Then this happened....

Click the image to open in full size.

Click the image to open in full size.

What other options do i have besides replacing the Y-pipe?

So that being said........ Buying a y-pipe, preferably cheap.
And i might as well buy a high flow cat as well since im going to be under there.
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Old 04-24-2013, 10:00 AM   #2
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You might be able to get a muffler shop to weld you in a new bung in the old location. I would at least ask.
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Old 04-24-2013, 10:02 AM   #3
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depending on where you live, you can get a y pipe from a junk yard for cheap. You could try to repair it with quik steel maybe, but I doubt it would hold up. Then with a repair, you run a risk of messing up your O2 sensor. There's plenty of our cars in junk yards, its probably best you replace it, or go aftermarket.


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Old 04-24-2013, 10:04 AM   #4
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Well if they were to weld something on, they would have to take the y-pipe off right?

So if they are going to go through the hassle of doing that, I might as well replace my y-pipe with a less restrictive pipe.

Oh & another question. Will an aftermarket y-pipe have the same o2 sensor holes for all my o2s? I think i have 4 from looking at the top of my engine bay. But today's work only involved replacing bank1 & 2 sensor 1

Last edited by rayrobot; 04-24-2013 at 10:33 AM..
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Old 04-24-2013, 11:03 AM   #5
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Our Maximas have 3. The 2 you replaced, and one behind (or in for 95) the catalytic converter. Aftermarket y-pipes have the bungs for the O2 sensors. If I were you, i would go with the aftermarket one.


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Old 04-24-2013, 11:06 AM   #6
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i was only replacing 2 sensors. I did not already replace 2 sensors. Sorry if that confused you. i was replacing the primary sensors in each bank.

The reason i guessed that there was 4 sensors was because in the front of the valve covers. In the middle, starting from the left; is the plug for o2 sensor bank 2 sensor 1. And i suppose the next two plugs to the right were for the o2 sensors for the secondary sensors in both banks.
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Old 04-24-2013, 01:17 PM   #7
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O2 Sensor Location 1996-2000 Federal Maxima

Click the image to open in full size.


O2 Sensor Location, 1996-2000 Maxima California / All 2001 Maxima

Click the image to open in full size.


Unless you have a California Maxima, you should have 3. If you are Cali spec, I'm not sure if they make an aftermarket Y-pipe that has the fourth O2 bung. Getting under the car and checking is probably the easier way to check. But I'm not sure where those plugs go to. I don't remember mine having plugs at the front of the engine.
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Old 04-24-2013, 05:01 PM   #8
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Okay, so this afternoon ; I went to several repair shops and most of them just suggested me to replace the y-pipe. One shop quoted me 120 to change the y-pipe. Is there anyone here in the NYC area could help me install a y-pipe for cheaper?

That being said, anyone know any cheap aftermarket brands that do not have much problems with fitment to a stock exhaust?

@Aflion The sensor that i was refering to in the front was the o2 sensor in bank 2 sensor 1.
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Old 04-24-2013, 05:05 PM   #9
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I say warpspeed, but I'm biased because I own one.
Wish I could afford and find a full cattman.
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Old 04-24-2013, 05:07 PM   #10
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I say warpspeed, but I'm biased because I own one.
Wish I could afford and find a full cattman.
How much did you spend for your warpspeed?
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Old 04-24-2013, 05:33 PM   #11
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How much did you spend for your warpspeed?
I think they are $230 ish but check their website. They have high flow cats as well. I wouldn't waste my time putting the stock garbage ypipe back on. You'll be happy with your newfound power from an aftermarket ypipe. Good luck.
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Old 04-24-2013, 05:43 PM   #12
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I think they are $230 ish but check their website. They have high flow cats as well. I wouldn't waste my time putting the stock garbage ypipe back on. You'll be happy with your newfound power from an aftermarket ypipe. Good luck.
http://warpspeedperformance.com/maxi...ti_i30_exhaust

I never really brought anything online, but is that price of 225 with or without shipping cuz its not stated. Or at least i can't find if it was stated.
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Old 04-24-2013, 07:40 PM   #13
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I'm going to assume its without shipping. Call them and ask they seem like good people. If money is tight check the classifieds I bought my y pipe used for $100.
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Old 04-25-2013, 11:49 AM   #14
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just got one $225 is shipped if you goto the website not ebay. its worth every penny, i was in the same boat a year ago and i was stupid did a patch repair the shop royaly fubar'ed then i replaced it myself much better. ...except now i bought a catback lol so dont let the mod bug bite
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Old 04-25-2013, 01:25 PM   #15
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Quote:
Originally Posted by rayrobot View Post

Oh & another question. Will an aftermarket y-pipe have the same o2 sensor holes for all my o2s? I think i have 4 from looking at the top of my engine bay. But today's work only involved replacing bank1 & 2 sensor 1
If you have a Cali spec 99 then you need a y pipe for that model. The Cali spec has 4 O2 sensors, all up front. The y pipe retains the front pre cat just below the manifold. All the O2 holes will be there.

All the other 4th gens have the same y pipe. They have 2 O2's up front, and one in the cat (95-96) and one behind the cat (97-99).
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Old 04-25-2013, 01:25 PM
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