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Old 09-25-2006, 07:41 PM   #1
83Rabbit
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Default How-To: Save upwards $100 on O2 sensor replacement

This is for 3 wire O2 sensors im assuming OBD1 since it has worked on both my 94 jetta and 94 Impreza.

Instead of spending 80-120 on a new O2 sensor for your obd1 3 wire setup, spend 20-30.

Bosch makes its 3wire o2 sensors and sells them for various cars with crazy markups depending on the make and model. The only differences in these o2 sensors is the plug, and sometimes that little difference can cost over $100 more.

What you can do is buy a 92 Mustang GT 5.0 O2 sensor which is also 3-wire. So far this was the cheapest out of the ones I could find. This costs between 20-30$ and is the EXACT same as the Impreza one which IIRC listed for $90 and the EXACT same as an mk3 golf/jetta one which lists at $130.

There are 3 wires for the o2 sensor, 2 white and 1 black.
-Cut the plug off your current O2 sensor. MAKE SURE TO CUT IT BETWEEN THE O2 SENSOR AND THE PLUG not before the harness connector. Leave enough for decent leads.
-Cut the new mustang o2 sensors plug off and strip all each set of leads.
-bust out the solder iron and solder the wires together. White to white, it doesnt matter which one you solder to which lead, just match the whites to whites and black to black. Cover the connections up with some electrical tape/heat shrink wrap, or other heat resistant tubing and horay, you just saved some $ to be better spent on other mods instead of wasting on markup prices.

I would have taken pictures but my digicam was dead. And for any skeptical people out there I have run this mod on 3 different cars and have seen hundreds of other people run it too. No CELs, no problems.
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Old 09-25-2006, 10:02 PM   #2
t3hWIT
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Thanks for the info. The prices for a new O2 are freakin ridiculous, but I didnt know they were interchangable. They do have universal ones, but I think they cost a few bucks more.
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Old 09-25-2006, 11:29 PM   #3
Subie Gal
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Interesting but....


the front 02 sensor for the 01 and older is less than $50 OEM and new...

and....

I wouldnt muck with non OEM parts as far as o2 sensors go
especially if you're in an emissions cert. state.

Jamie
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Old 09-26-2006, 12:28 AM   #4
8Complex

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Yeah, it'd work and be pretty cheap, but have you ever tried to solder O2 wires together? It's absolutely impossible. Some kind of coating on them prevents it... I've tried it many many times, and only had it stick once, and I think that was because I balled up the wires and soldered a huge chunk of it together.

Personally I'd love to replace my rear O2 once and for all, but the fact that OE Subaru bungs seem to strip while just looking at them makes me never want to change another O2 again.
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Old 09-26-2006, 12:41 AM   #5
83Rabbit
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Quote:
Originally Posted by Subie Gal View Post
Interesting but....


the front 02 sensor for the 01 and older is less than $50 OEM and new...

and....

I wouldnt muck with non OEM parts as far as o2 sensors go
especially if you're in an emissions cert. state.

Jamie
The only non-OEM part is the plug And if anyone is that concerned, they can just re-pin the connector which would cut out the need for any splicing, and in the process making the more cost effective O2 sensor completely 100% OEM

As far as the wires are concerned it can be a bit tricky, yes. I've found that preheating the wires and touching the solder to the wire and not melting it on the iron and then trying to place it on the wire works the best. Do it on each lead, then twist them together and heat the wires again and add a touch more solder to the outside.

Once covered up again with the heat shielding for the wires theres no way to tell anything was altered if you are in an emissions cert. state where they would even bother to check the O2 sensor (which in VA I have never seen them do a visual inspection of the sensor and its wires).

I was unaware that the 3-wire O2 was $50 new for our cars. The 3 places I had checked were all above $80, that being Napa, Autozone, Advance. And since it was a saturday and I didnt want to wait to order till monday and then wait for shipping from some other company, I just decided to go the cheaper route.

Not claiming my way is any better than OEM, just offering people another alternative if they chose to save a bit of coin and replace an old O2.
Remember if you fudge it up or its not working properly, youll throw a code and get a CEL for the o2 sensor (someone correct me if I am wrong). I again, have never seen nor heard of anyone running into any sort of problems with this mod, nor have I
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Old 09-26-2006, 01:37 AM   #6
Charge
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I just did a front O2 sensor on my 01 and I paid about $75 for it...and I thought most of the Suby online shops had it for about $68...so was there a recent price drop on this part?

I just checked on Subarugenuineparts.com...and the part number(22791AA00A) came up as $69.26.

So $30 isn't a bad deal.

I was curious if this was an option. All the Miata people recommend it. The Mazda part is like $230. I think the Bosch or Denso generics are about $150. Then there's the raw one that Bosch sells, that is the sensor with no plug, designed to be spliced(and includes heat shrink tubing for it), that sells for like $70. Some had mentioned on the older ones with single wire sensors, that there are $25 options out there and a few on miata.net talked about other choices for the multi wire plugs, too.

Also...as far as I understand it...the single wire cars can use the multi-wire sensors, right? The only benefit of multi-wire is it preheats the sensor, so it'll read accurately on start-up? That's how I understood it. Not sure if maybe the 95 or 96 cars used single wire maybe?

Last edited by Charge; 09-26-2006 at 01:43 AM.
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Old 09-26-2006, 12:32 PM   #7
83Rabbit
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Im not entirely sure on the single to multiwire sensors, however that would be interesting to know. Although that sure is odd that its cheaper for a mustang 3 wire sensor than the universal 3 wire counterpart lol, It seems the markups on these parts are similar to the car audio market haha.
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Old 09-26-2006, 12:34 PM   #8
83Rabbit
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Quote:
Originally Posted by Charge View Post
Not sure if maybe the 95 or 96 cars used single wire maybe?
my 94 sensor was 3 wire. I think the only single wire sensors are pre obd1 cars. My Old VW rabbit for example, 83 had a single wire o2 sensor origionally before I switched to european Injection.
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Old 09-26-2006, 08:39 PM   #9
83Rabbit
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As a point of info, the part number on the O2 sensor I used is 13942
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Old 09-27-2006, 04:20 PM   #10
Chad W
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I've saved myself well over $100 a pop doing this on old saabs. The interesting thing is that the ford connector is $10-15 cheaper than the generic bosch, which comes with no plug, just bare wire and a few connectors.

An no there is no effect on emissions.
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