Just a simple question, hopefully someone can help me.. really need to pass that inspection, then I can get on to actually fixing the thing.

 

I read/understand (I think so at least) the non-fouler trick. Now, what size non-fouler do I need? Does anyone by chance know a part number or which model car it should fit? I check autozone web site, and what they have differs by car model/manuf. Or do o2 sensors come in the same size as spark plugs?

Yes they (o2) are the same thread as plugs. I got a 2 pack (I think 18mm) at advanced for a few bucks. Just drill out the top one.

good luck

bob

The brand is "HELP!" and the part number is 42009.

 

Worked well on my car. Still wish I could figure out why my car is throwing the code and fix it rather than working around it with this trick.

#42002 will work as well, with a 22mm wrench.

 

Dont use it on your front O2 sensor as it will screw-up your air-fuel mixture and make the car run like hell.

If you still get the code (P0420 i presume) after the trick just replace the front with a Bosch, inexpensive vs. OEM.

 

if youre getting the PO130 this will do nothing for it, then its an electrical issue within the circuit.

 

Good luck! Seems like you're having a tough time with that inspection...

Thanks for all the replies. This forum is a really great asset to all the poor grad student Subaru owners.

 

Just a couple more questions--are the universal 3-wire sensors as good as the regular replacements? As I understand it, it's just a matter of connecting the wires. Also, are the front and rear sensors interchangeable? And should I get heated or unheated?

 

It's for a 98 OBW with a P0420 code.

the front sensor should be a subaru part. the rear can be generic. technically the parts are the same, just the connectors are different but thre front MUST be a subaru part. get it on line . the other one can be cheap.

 

or get 2 cheap ones and do the anti fouler trick. but there is a much greater chance the cats will not work properly if you do.

 

 

www.subarupartsforyou.com

 

www.chaplinssubarugenuineparts.com/oe_parts_cat.html

Edited January 23, 201016 yr by johnceggleston

Both of mine are Subaru and they are NOT the same. They look different and cost different (the rear is much pricier). The whole thing looks different, as I recall.

 

the front sensor should be a subaru part. the rear can be generic. technically the parts are the same, just the connectors are different but thre front MUST be a subaru part. get it on line . the other one can be cheap.

 

or get 2 cheap ones and do the anti fouler trick. but there is a much greater chance the cats will not work properly if you do.

 

 

www.subarupartsforyou.com

 

www.chaplinssubarugenuineparts.com/oe_parts_cat.html

Both of mine are Subaru and they are NOT the same. They look different and cost different (the rear is much pricier). The whole thing looks different, as I recall.

 

what car / year?

2000 obw. auto tranny.

i always forget to state my year and model.

 

on one of my cars maybe both, 95 lego or 97 gt, when i had the exhaust off, i compared the front and rear. both were had 3 wires, both had the denso name on them and both had the same number stamped on them. only the connectors were different.

 

00 obw is the phase 2 SOHC, maybe they changed the spec.