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Great O2 Sensor Deal

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Old 11-19-02, 07:33 PM
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I have a downpipe and the stock cc . The car had 45k miles on it but the air pump was making a heck of a lot of noise . Petit racing just disconnected the electrical connectio9n to the airpump and adjusted the idle and the car runs fine. Will this clog my cat or screw up my o2 sensor? It has never been replaced.
Old 11-25-02, 02:58 PM
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Re: Great O2 Sensor Deal

Originally posted by cewrx7r1
Auto Medic Supply at http://www.oxygensensors.com/ has a great price and sensor for the FD if you want a one wire like the stock unit.

I just had one sent to me for $34.99. It has a 20" long insulated lead with a stock Mazda connector on it. It is made by NTK which also makes the stock Mazda O2 sensor.

You can find a car's sensor by make,model,and year; or even Mazda part number. I got their part number 250-21020, which is listed for a 1994 Mazda RX7 R2-1.3L.
I ordered one from the web site. They had it listed by vehicle make and model but that "part #250-21026 is wrong". It has a 12" wire connector and the OEM has a 16" wire connector. It does say NTK on it though.

I called and they said they will send a replacement and didn't know about the website mistake untill after it was shipped.

The wrong part number one should fit perfectly for DP's other than HKS since the O2 sensor is mounted closer than stock.
Old 11-25-02, 03:19 PM
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As far as splicing the connectors I heard that you are not supposed to solder them together because then it does not read right. Is this true.
Old 11-25-02, 05:57 PM
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get the universal bosch ones they sell at auto zone, etc for 20 bux. works great
Old 11-25-02, 07:03 PM
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Originally posted by Fish Eye
As far as splicing the connectors I heard that you are not supposed to solder them together because then it does not read right. Is this true.
----------------------------------
The only thing that will change the "accuracy" (resistance) is if you use a different gauge wire to splice or increase/decrease the length of the wire dramatically. Try to use the same gauge, never smaller. Solder has no effect, it just makes the connection more permanent so that it will never work free on it's own if the crimp fails. Don't overtighten it, just seat it gently and forget about it for 25,000 miles or so..........they last a long time.
----------------------------------
Above quote from RonKMiller on a similar thread.


My bro-in-law (20+yr Honda Tech) told me not to solder them but I have no proof either way so I purchased it with the wire.

Last edited by GoRacer; 11-25-02 at 07:06 PM.
Old 11-25-02, 07:05 PM
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Originally posted by legendr36
get the universal bosch ones they sell at auto zone, etc for 20 bux. works great
Do they come with the wire and connector?
Old 11-25-02, 07:51 PM
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Originally posted by GoRacer


Do they come with the wire and connector?
It does not include the wire and connector. You must use the original one, however attaching the OEM plug/wire is very simple and takes minimal modifications and effort. No solder gun is required. The Bosch O2 sensor has a metel clip at the end, where you insert part of the oem wire and crimp them together. The kit also inlcudes a heat shrink wrap which wrapps around the the exposed clip/wire and protects it from water and other elements.

Last edited by legendr36; 11-25-02 at 07:58 PM.
Old 12-29-02, 02:45 PM
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Re: Great O2 Sensor Deal

Chuck,

This is a great deal, and am ready to pull the buy trigger.

One question. Will the Walker oxygen sensor give my Apex Power FC the data it needs to make accurate AFR readings? I know you have the Apex PFC also, so...

Is there any other oxygen sensor I should go with besides the stock one?

Thanks for this link! I plan to order one Monday, if the Walker unit works as well as the stock oxygen sensor unit...

Originally posted by cewrx7r1
Auto Medic Supply at http://www.oxygensensors.com/ has a great price and sensor for the FD if you want a one wire like the stock unit.

I just had one sent to me for $34.99. It has a 20" long insulated lead with a stock Mazda connector on it. It is made by NTK which also makes the stock Mazda O2 sensor.

You can find a car's sensor by make,model,and year; or even Mazda part number. I got their part number 250-21020, which is listed for a 1994 Mazda RX7 R2-1.3L.
Old 12-30-02, 11:13 PM
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my o2 sensor has 200+K miles on it.......... time for a replacement?
Old 12-30-02, 11:14 PM
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I got a Bosch one from www.kragen.com for $17 bucks...... works fine and another friend got the same one......
Old 12-31-02, 12:08 AM
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Direct plug-in, or soldering required?
Old 12-31-02, 01:04 AM
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wire crimpers
Old 12-31-02, 03:04 AM
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just ordered one!
Old 12-31-02, 09:26 AM
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Walker or Bosch?

Originally posted by 93BlackFD
just ordered one!
Old 12-31-02, 04:01 PM
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I checked out Kragen's website just to see the prices $18 - $200
Click "here" and you figure it out.

Anyhow, I was curious cause a g/f of mine works for Schucks in WA and she says she delivers to the dealers all the time and she can't wear a badge or shirt with Schucks on it because they don't want the customers to know where they buy the parts "lol".

Last edited by GoRacer; 12-31-02 at 04:08 PM.
Old 01-05-03, 03:45 PM
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actually, if you look at the picture they provide, the part number is 250-2120 but when you buy it on their site it adds it as 250-21020




Last edited by damian; 01-05-03 at 03:56 PM.
Old 01-05-03, 04:08 PM
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Got mine in the mail. It looks slightly different $35.99 was a steal. It came in 3 days.
Old 01-05-03, 04:51 PM
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pic of stock vs walker unit



Old 01-06-03, 11:47 AM
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hmmmm, i might have to pick one of them up.....oxygen sensor is going on 10 years next year.
Old 01-06-03, 12:44 PM
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Damn that walker unit looks shorter on the tops side (anyone have a measurement?) My bung was welded inboard a little too far and the top of the o2 sensor hit the turbo housing, that one looks like it would clear, I only need a 1/4 - 1/2 inch.
Old 01-06-03, 03:44 PM
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deceptive

it seems shorter but it is deceptive because the bolt part is in a different spot, here is a photoshop-hacked image to compare, they are about the same zoom ratio so it is relatively accurate in comparing the length difference (relative , not absolute)

Old 01-06-03, 04:01 PM
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Originally posted by jkekeisen
Damn that walker unit looks shorter on the tops side (anyone have a measurement?) My bung was welded inboard a little too far and the top of the o2 sensor hit the turbo housing, that one looks like it would clear, I only need a 1/4 - 1/2 inch.
Same here. I'm gonna have to halfway take off the downpipe in order to get my new o2 sensor in.
Old 01-06-03, 05:36 PM
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In the diagram it states Ford 90-92. Does this mean there is a $35 Ford OEM O2 sensor that is the same as our $212 Mazda O2 sensor? Has anyone checked out Ford Probe O2 sensors from 90-92? I like the price of the Walker unit, but if you can get the same OEM sensor for under $50 that would be excellent.

eric
Old 01-06-03, 06:50 PM
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>>In the diagram it states Ford 90-92. Does this mean there is a $35 Ford OEM O2 sensor that is the same as our $212 Mazda O2 sensor?

i dont think so hapa, all it means is that it can 'replace' the ford sensor.
Old 01-07-03, 12:18 AM
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Hmmm, well I received mine today:
- doesn't say NTK on it
- doesn't say Walker on it
- doesn't look like the pix that damian posted
- does have a 20" wire
- does have "JAPAN 5340 11C" stamped into it

I'll try it out this week...


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