i drive a 00 ex .my catalytic converter is busted so i thought why not just get a whole new cat back. the exhaust right now is stock, and i'm really not sure if it has an oxygen sensor in it or not. so should i be looking for a cat back with an o2 sensor or not even worry about it. thanks.

 

If yours has it, then its a good idea that you should make sure the new one you get has it too.

 

Yes, your 00 EX does have a secondary O2 sensor in the cat. Getting a cat back exhaust will not eliminate your problem because cat back means from the catalytic converter back to the end of the car. In other words, you still need to use a cat. So I would suggest getting a new catalytic converter with your cat back exhaust.

 

Or buy a test pipe =]

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18CivicEJ8 &raquo;</TD></TR><TR><TD CLASS="quote">Yes, your 00 EX does have a secondary O2 sensor in the cat. Getting a cat back exhaust will not eliminate your problem because cat back means from the catalytic converter back to the end of the car. In other words, you still need to use a cat. So I would suggest getting a new catalytic converter with your cat back exhaust.</TD></TR></TABLE>


B18CivicEJ8 is right, catback systems don't include the cat, at least that's the case in my accord.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aries331 &raquo;</TD></TR><TR><TD CLASS="quote">


B18CivicEJ8 is right, catback systems don't include the cat, at least that's the case in my accord.</TD></TR></TABLE>
Thats the case with all cars.. As already stated you get the catback exhaust but need to replace the cat. Purchasing that exhaust wont help with your cat problem just get a "high flow" cat online they work just as well, Are cheaper than oem and replace that while installing the new exhast...

 

Get a cat-back and some kind of replacement cat, otherwise you'll have a CEL if you run a gutted cat/test pipe.

 

yeah even if you only had the primary in the exhaust and nowhere for the secondary to screw in, you would still need to have the secondary o2 plugged into the connector or the ECU will hate you.

 

Even if he just has it plugged in the ECU will still hate him because the secondary O2 will be sensing to much Oxygen.

 

test pipes do not have o2 sensors do they??

mine doesnt.. but mines obd1

 

OBD1 cars have 1 O2 sensor before the cat (or test pipe). OBD2 cars have 2 O2 sensors, one before the cat and one after.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jbur074 &raquo;</TD></TR><TR><TD CLASS="quote">test pipes do not have o2 sensors do they??

mine doesnt.. but mines obd1</TD></TR></TABLE>

The purpose of the secondary O2 sensor is to test catalytic converter efficiency - it's an emissions only O2 sensor - it doesn't make adjustments to the fuel trim like your primary O2 sensor does.

With that said, obviously putting a secondary O2 sensor into a test pipe would be worthless as hell.

 

with the o2 sensor not plug in, your car would run shiet. with out it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vdawg559 &raquo;</TD></TR><TR><TD CLASS="quote">with the o2 sensor not plug in, your car would run shiet. with out it.</TD></TR></TABLE>

They're talking about the secondary O2 sensor, chief, try to stay w/ the program.

It won't have any effect besides throwing a CEL.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Syndacate &raquo;</TD></TR><TR><TD CLASS="quote">

They're talking about the secondary O2 sensor, chief, try to stay w/ the program.

It won't have any effect besides throwing a CEL.</TD></TR></TABLE>

Idunno. I heard that that's what killed the dinosaurs.


OP: buy a CAT, not a test pipe, preferrably an OEM cat with an O2 sensor. The O2 sensor should go into your cat. What do you mean your cat is busted? what's wrong with it? You need it to pass emissions. It doesn't affect fuel trim...it's strictly a monitor.

 

If you're bent on having some kind of "performance" in your cat, then do the world a favor and get a high-flow cat...flows better, without near as much pollution and annoying sound


http://cgi.ebay.com/ebaymotors...ZWDVW

^$65.10 shipped to your door^

 

With the second O2 sensor not reading any oxygen, your motor will begin to run more lean. At least on OBD2 systems. and Vise versa, The sensor with too much oxygen will cause the motor to run very rich. Both applications will throw the CEL to come on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ixoiiiiviviiivi &raquo;</TD></TR><TR><TD CLASS="quote">With the second O2 sensor not reading any oxygen, your motor will begin to run more lean. At least on OBD2 systems. and Vise versa, The sensor with too much oxygen will cause the motor to run very rich. Both applications will throw the CEL to come on.</TD></TR></TABLE>


what?

The 2nd O2 sensor DOES NOT AFFECT FUEL TRIM AT ALL. It is only a monitor. There can't be "too much oxygen" for the 2nd O2 sensor.

It needs to read very high oxygen (a constant low voltage) content all the time in closed loop operation for the CEL not to turn on. That's how the ECU knows that the cat is working/present.

the PRIMARY O2 is the only one that controls fuel curve.