my friend just installed a header on his 96 civic and now his car is throwing codes. from what i gathered he had to extend the wires on one of the o2 sensors. is this a common thing among ob2 civics? i did search but didnt get any answers. thanks to all who can help

 

What model civic (EX, DX)?

Did he drop the sensor when swapping it over? He may have also pulled the wires out of the plug if he wasn't careful. It can sometimes be hard to get that plug apart...

 

i don't know if he dropped/damaged the sensor in anyway, but i will ask him. he thinks the problem is due to the car not having a cat anymore. the old cat was built right into the stock (cracked) exhaust manifold so when he removed it, it also removed the cat. could that be causing the code?

 

first, check what code he's throwing. then come back.

 

how do you check the code?

 

https://www.honda-acura.net/forums/s...d.php?t=125370

So, it must be a DX/LX then if the cat was in the header. The problem he's facing I'm sure is that he now only has one bung for one O2 sensor. The DC header is only made for the OBD2 EXs because of the CAT being in the OEM header. If he used an EX header, he needs to either get an EX CAT or get another bung welded into a test pipe for the secondary O2 sensor.

I'm willing to bet that he didn't mount one of the O2 sensors and that's causing the code.

Also, because it's a DX/LX he will have to extend the wires for both O2 sensors.

 

westcoaststyle hit it on the head. You're missing the secondary O2 now. You'll be throwing a code for one of the O2's...

 

well the header has 2 'bungs' for both the o2 sensors. i'm starting to thing they damaged one while removing it. i will get him to check what code its throwing then get back to ya. thanks for all the help

 

What header is it? Brand, I mean.

 

it is a ractive header.