I have a 99 civic ex and just got a tsudo catback put on it and now my check engine light is on and i read the code and its the o2 sensor. So do you guys think that maybe the fried my 02 sensor when they were using the mig welder or do you think i just need a dummy sensor? Thanks for any help

 

https://honda-tech.com/forums/showthread.php?t=2407755

 

alright my bad sooooo can anybody help me

 

you prob need a fake o2 sensor, ""dummy" whatever, its just going to happen, if you think they have fried it, pull it out and test it...... how do you test it? i have no idea but its prob. because of the new kit. have you tryed getting the code cleared? autozone, and advanced auto will do it for free.......... but dont let it go like that for long without fixing it.... you'll use up a **** ton of gas

 

Primary or secondary o2 sensor code?

 

so if i got a dummy would i still be able to pass inspection?

 

im not real sure the guy at autozone just told me it was my 02 sensor....i think the code was p0104 if that helps.

 

Also it seems like i cant hear or feel my vtec crossover since i got my catback put on

 

Any help would be greatly appreciated

 

p0104 is not an OBD-II code. Getting the code should make this a piece of cake.

 

Alright first thing tomorrow morning im going to get the code read again and post it on here.

 

ok so i got the code and its p0141 and it says that a malfunction exists in the heater circuit for oxygen sensor 2 in bank 1.

 

That's your secondary O2 sensor, don't worry about the bank stuff, that's for V6's and V8's (etc.).

Are you running a test pipe?

 

ok no im not i still have the oem cat

 

As said above, this is a code for the O2 sensor screwed into your cat

Check and make sure no wires were cut/damaged/pinched.
Reset the ECU and check to see if the code comes back.
If everything is good and the code comes back, you might need a new O2 sensor.

If you get an O2 sensor, go ahead and make sure it is a Denso brand. There are very few OBD-II hondas that like the Bosch replacements sold at most auto parts stores. I would check Majestic Honda's website for a good price.

 

ok so its not the one thats close to my oil pan? Its the one plugged into my cat? and how exactly do i reset my ecu?

 

It is the one plugged into your cat.

You can pull the ECU fuse, or disconnect the battery (just make sure you have the radio code).

I would recommend pulling the fuse.

 

Ok i just looked for a sensor on majestic honda and i couldnt find one and are you talking about the security code for the radio

 

http://www.hondaautomotiveparts.com/...5=EXHAUST+PIPE

^Looks like #27

Yes, the security code for the radio.

 

alright thanks alot for all your help i really appreciate it.

 

No prob, and good luck.

 

Yes #27 is what you need



36532-P2P-A01 SENSOR, RR. OXYGEN $212.72

 

Is #27 considered the sensor after the cat?

 

After the cat?

Secondary O2 sensors on an EK EX are screwed into the cat itself...there are no sensors after the cat.

In the above diagram, #40 is the Primary O2 sensor, and #27 is the secondary sensor.

 

ok well i went to autozone and they asked me if i needed the one before or after the cat