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How do I choose the proper o2 sensor?

 
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Old 12-09-2010, 01:53 AM
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How do I choose the proper o2 sensor?

Im trying to change my o2 sensor that fails my emissions inspection on my 2000 base lude. Which Denso o2 sensor do I buy? Front or rear? And which inch lead wire?

Denso automotive parts available online at DensoProducts.com
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Old 12-09-2010, 03:04 PM
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Re: How do I choose the proper o2 sensor?

1. Dunno
2. Which one failed? and Why?
3. Go to autozone, ask to look at one for your car, measure the lead wire.
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Old 12-09-2010, 03:28 PM
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Re: How do I choose the proper o2 sensor?

RockAuto Auto Parts
Then, choose which oxygen sensor.

Then, choose any brand but Bosch.
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it'll sound like an ultralight airplane or a moped exhaust funneled through a kazoo.
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Old 12-09-2010, 05:48 PM
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Re: How do I choose the proper o2 sensor?

u can use a single cam o2 sensor for the dual cam engine so long as its the same amount of wires. Im runnin a single cam 4 wire o2 sensor in my car (h22). Paid $10 for it haha
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Old 12-09-2010, 07:54 PM
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Re: How do I choose the proper o2 sensor?

I think ngk makes an o2 sensor, check sparkplug.com
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Old 12-09-2010, 07:56 PM
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Re: How do I choose the proper o2 sensor?

Hey gey oem
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Old 12-09-2010, 07:59 PM
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Re: How do I choose the proper o2 sensor?

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Hey gey oem
wut??
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it'll sound like an ultralight airplane or a moped exhaust funneled through a kazoo.
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Old 12-09-2010, 08:41 PM
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Re: How do I choose the proper o2 sensor?

Go to advance autoparts or autozone borrow the Code reader and find out if it is bank 1 or a bank 2. Bank 1 is your upstream sensor, and Bank 2 is your downstream. Upstream is before the cat, and downstream is after the cat. Denso will suffice, Bosch is a bit expensive..
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Old 12-09-2010, 08:52 PM
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Re: How do I choose the proper o2 sensor?

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Originally Posted by azn13oi90 View Post
Go to advance autoparts or autozone borrow the Code reader and find out if it is bank 1 or a bank 2. Bank 1 is your upstream sensor, and Bank 2 is your downstream. Upstream is before the cat, and downstream is after the cat. Denso will suffice, Bosch is a bit expensive..
Thank you! Exactly what I was looking for. I believe pepboys give free cel checks if you sign up for their free rewards cards. But exactly how do you borrow a code reader from aap?
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Old 12-09-2010, 08:54 PM
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Re: How do I choose the proper o2 sensor?

Just go in and ask them to look up a code for you. They'll do it for you, takes five minutes tops. If they only give you a code and don't explain it (sometimes they do) then write down the code and you can look it up on the net. The site is obd2codes.com or something like that. Just google it.
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Old 12-09-2010, 09:10 PM
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Re: How do I choose the proper o2 sensor?

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Originally Posted by azn13oi90 View Post
Go to advance autoparts or autozone borrow the Code reader and find out if it is bank 1 or a bank 2. Bank 1 is your upstream sensor, and Bank 2 is your downstream. Upstream is before the cat, and downstream is after the cat. Denso will suffice, Bosch is a bit expensive..
This is for 5th gen right?
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Old 12-09-2010, 09:11 PM
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Re: How do I choose the proper o2 sensor?

Its for OBDII. And 5th gens are OBDII.


So yes.
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Old 12-09-2010, 09:34 PM
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Re: How do I choose the proper o2 sensor?

I work at advance auto parts :D I personally don't go to peoples cars anymore.. its 32 or less in boston.. I DONT CARE even if ur the hottest woman LOL. I installed this womans battery in her car.. dumb as she is decides to turn on the headlights.. like I wasn't even there ..could've died...
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Old 12-09-2010, 09:37 PM
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Re: How do I choose the proper o2 sensor?

Whatever you do, don't get universals.. yea they are cheap.. but it doesn't have an end connector... you have to splice, solder or ghetto tape it. Keep in mind the sensor is on the exterior therefore it is exposed to all elements..aka water, snow. So be smart spend teh few extra dollars for a proper one.
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Old 12-09-2010, 11:48 PM
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Re: How do I choose the proper o2 sensor?

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Originally Posted by azn13oi90 View Post
Whatever you do, don't get universals.. yea they are cheap.. but it doesn't have an end connector... you have to splice, solder or ghetto tape it. Keep in mind the sensor is on the exterior therefore it is exposed to all elements..aka water, snow. So be smart spend teh few extra dollars for a proper one.
thanks, great advice. last question, where exactly is the bank 1 and bank 2 o2 sensors? under the hood or under the car? I've searched and can't locate it

and should I get the 23.43 or 19.8 in. lead wire?

Last edited by viciousK; 12-09-2010 at 11:52 PM.
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Old 12-10-2010, 12:03 PM
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Re: How do I choose the proper o2 sensor?

Hmm im not too familiar with 5th gens locations... i would say lift up the front end and follow the exhaust, the downstream is simple, the upstream im going to guess its on the bottom of your header. You could possibly see it as you open the hood.. im not sure. more 5th geners should be able to tell you more. For the lead wire again im not sure but give me a few mins and ill look
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Old 12-10-2010, 01:46 PM
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Re: How do I choose the proper o2 sensor?

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Originally Posted by azn13oi90 View Post
Hmm im not too familiar with 5th gens locations... i would say lift up the front end and follow the exhaust, the downstream is simple, the upstream im going to guess its on the bottom of your header. You could possibly see it as you open the hood.. im not sure. more 5th geners should be able to tell you more. For the lead wire again im not sure but give me a few mins and ill look
This is why I don't take advice from people who work at advanced auto lol.

Haha I'm just messin with ya bro.


The o2 sensors on a 5th gen are located underneath the vehicle. You will not be able to see them from the top of the engine bay. Jack up the front of the vehicle, and follow the exhaust pipe back. You'll see a portion of the exhaust a foot or so back from the end of the collector which is larger in diameter than the exhaust piping, with a metal heatsheild bolted over it. This is your catalytic converter.

There are two o2 sensors, an upstream and a downstream. This is refrencing their position in relation to the catalytic converter. The upstream one is directly in front of it, and the downstream one is directly behind it.

As an extra tip: the upstream sensor is also referred to as the primary sensor, and the downstream is also called the secondary sensor.

As far as wire leads go, they should be able to give you the proper o2 sensor based on the make and model of your car, so you shouldn't need that information when you go in and buy them.


Good luck.
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Old 12-11-2010, 03:22 AM
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Re: How do I choose the proper o2 sensor?

thanks havik, the details really cleared a lot of things up.

So I just got my CEL checked and it said all the cylinders were misfiring and bad primary o2 sensor. before I can replace the o2 sensor, I gotta fix the misfiring first, right? or it'll mess up the sensor? (I'd figured the misfiring was caused from bad o2 sensor, but im guessing not now) What should I do now?
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Old 12-11-2010, 01:56 PM
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Re: How do I choose the proper o2 sensor?

A cylinder misfire can cause a false o2 sensor code. The o2 sensor is probably fine, but the misfire is causing the sensor to read way out of normal, and throwing a code.
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Old 12-11-2010, 02:08 PM
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Re: How do I choose the proper o2 sensor?

Try a set of plugs and wires first to try to get rid of the random multiple misfire code first. If one or more of the cylinders are missing or not firing, then you are dumping raw unburned fuel into the exhaust, prob making your 02 sensor code come on. If you leave it like this for too long, it can make the Cat go bad.
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Old 12-11-2010, 06:34 PM
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Re: How do I choose the proper o2 sensor?

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Originally Posted by Phantom240 View Post
A cylinder misfire can cause a false o2 sensor code. The o2 sensor is probably fine, but the misfire is causing the sensor to read way out of normal, and throwing a code.
What could be the reason for misfire? I've got a pretty new wire set and spark plugs. Could it be the distributor cap and rotor? Will clearing out the EGR valve work? Where should I start?
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