I got a code 41 - Primary Oxygen Sensor - Heater circuit malfunction, from my CEL from a 96 civic, stock ECU. Easy fix? Just replace the O2 sensor? THe primary one is the very first 02 sensor right on top of the exhaust manifold, correct?

I noticed a little rough idle but when accelerating or crusing, it seems fine.

 

bump

 

On my car i had a code 41 and just replaced the o2 sensor and it runs fine now that is on my obd 1 im pretty sure the obd 2 primary is the one on the header but im not exactly sure bout that.

 

the primary is the one upstream (before the cat).
yes, replace the sensor and you should be ok.

 

primary o2 on OBD2 is on the header/exhaust manifold. 2ndary is on the cat. Check the wiring for your primary first. There is also a way to check if the oxygen sensor is bad. need a voltmeter. I am throwing a code 41 and I am 99.9999999% sure it is wiring. however, you should use process of elimination before dropping money on stuff

use voltmeter on o2.....search...it is on here on how to do it--easy way to tell if it is bad

check wiring -

 

its on the header.

 

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Very good idea. I usually use an ohm meter to measure the resistance of the o2 heater to verify it's bad.