Hi guys,

I'm trying to help my buddys fiance' out, she just moved here from New Mexico and they got engaged and all that crap... anyways

she's got a 97 civic ex coupe

i haven't really looked it over, but, she bought it from some kid in san diego and i see it has some dc headers, and looks like an apexi catback, theres side markers and a short shifter, component set up front and some other stuff...

well her check engine light has been on since she bought it... and like alot of girls (i didn't say "all", i said "alot"), she just kept driving and driving until i seen it and decided to check the code.

its code 67, and according to c-speed's webpage, it says:

"Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system"

does this mean the cat is junk? or gutted or something? or could it be from a bad o2 sensor? or maybe a bad seal on the o2 sensor or something?

thanks guys
-mike

 

Probably a bad 02.

 

hmm... wonder why it doesn't just give a "bad o2" code...

got any other ideas?

 

Hey, thats funny this post is up. I was wondering the same thing. I own a 2000 civic si with 50,000 miles. My check engine light is also on for code 67. my car backfires from under the car and makes little clicking noises from under also. One of my guesses is though ... I think my spark plugs and wires are bad causing it not to burn all the gas. But then again that does bring back the question of why it didn't throw out an o2 sensor code. Its weird. I took a look at it yesterday but didn't visually see anything wrong. I plan to take the cat out today and check it out. Can anyone help us?

 

any more ideas?

 

on all 96 up cars lss then 100k i think... i work fora smal crdelrship and i took a car in fo the same thing and they change the oil,plugs, and dst cap , they say it had to do wth emissons any way it waslike 1500 worht o work when they where done.. check in to it

 

on all 96 up cars lss then 100k i think... i work fora small car dealership and i took a car in for the same thing and they change the oil,plugs, and dst cap , they say it had to do wth emissons any way it was like 1500 worht of work when they where done.. check in to it

 

I just ordered new spark plug wires (magnecor 8.5mm ) today. Hopefully that will help! I also have like 2 month old plugs in so I shouldn't have to change those. I took a look at my cap and rotor and stuff, nothing bad there just the plugs. I'll let you know if it fixes it when I get them

 

whats the dilly yo? CEL go away?

 

well.. I haven't got the plug wires yet. Suppose to be in at the latest by this Wednesday . So yea my cel is still on I need to take my cat off and check it out but I've been real busy with work and school. I'll keep ya updated though.

 

any word holmes?

 

plug wires aren't going to fix it. the problem code is coming from you secondary O2 sensor. either an O2 sensor has gone bad or your cat has gone bad. i had this code on my turbo LS when i ran a 3 inch cat. the way i fixed it was i cut the constant voltage wire to the ECU. that code never came on again.