Tried this in the other forum but no luck.

Took my car for it’s second emissions test and it failed the CO part again. I failed the 15mph part but not the 25mph (again) so I assumed it was just my filter because it was rusted like hell and thought it was not getting enough oxygen at that low of speed. Put a new one on and my CO was actually higher, WTH?

2nd run at 15mph - CO (Standard 1.20) = 3.85 (failed)
I noticed on the second run my RPM on this test was higher so this explains the higher CO number.

Anyway, I’ve got a 2nd gen B16a but with a 1st gen header and still OBD0 and I know I need 2 o2 sensors with one wire on each but what vehicle to ask for? I will just get the universal bosch sensors but do they come as a set (for my header) or do I need to buy two separate ones?

Any help would be greatly appreciated!

JG

 

You should be safe with ordering the O2 for an 88-91 civic SI sohc. Just ask for two, since they will assume you only need one. I prefer the brand NTK.

 

if you need 1-wire o2's i got like 3 of them (let me know if you need the o2's)

 

Thanks for the reply guys. I too found out that I could use stock Si sensors but I would need two.

hatchinprogress, thanks for the gesture but I would have to buy some new ones just to be on the safe side so that I can pass emissions hopefully on the third try, assuming it's the sensors.

I'm going to try new rotor, cap, sensors and maybe retard the timing. I put that Pass emissions stuff in my gas but supposedly you have to wait until all of the gas is finished and then go with new gas. I've been trying to go with it still in the tank, don't have a lot of time to wait. We'll see what happens.

JG

 

no problem, good luck man i know emissions can be a pain