Quick, Which o2 sensor is the primary sensor

[89accordlxi]

I just got a check engine light a few days ago. I checked the light and it blinked twice. Which means o2 sensor B might be bad. It hasn't come on again since the first time, but I figuired its time to replace it anyway. I want to replace both, but my parts store only had one in stock... So for now, I will replace sensor B. So which is sensor a and which is sensor b

Thanks.
Peaceout..

[BLck89accord]

sensor a is on left side of manifold if i remember correctly, and b is on the right.....depending on what kind of manifold you have.....i have the dc sports header, so that is crossed up now, with a on the right and b on the left, which explains why my car ran like shit for a week and a half becuz the guy that installed my header forgot to switch them, so they were crossed up. Caused check engine light to come on while driving down the road, (never when i started it up, but several miles down the road each time) and also made my exhaust spit and pop when taking off slow or normal.

R©

[89accordlxi]

Thanks R©, I replaced the right sensor and will do the left when I get another one. Damn, those o2 sensors are a Biatch to loosen. I spent over and hour trying to break those dang things loose. I had to grind down the special o2 socket for it to work.

I must say however, the car doesn't seem so sluggish anymore. Hopefully replacing the second one well help further..

Peace out...

[BLck89accord]

glad to help