Chech Engine Light From O2 Sensor?

[edwardsirignano]

I've just put headers and a exhaust system on my 1997 Honda Civic. The headers came with only 1 spot for a o2 sensor. The car has 2.
[1] Is the second o2 "really needed"?
[2] How can I bypass it to turn the damn check engine light off?

Thanks

 

[xj0hnx]

OBD II cars run two o2's and their ECU's look for them.As far as how to get rid of the CEL there are a couple of ways,run a chipped ECU that doesn't care and I've seen these things you can plug into the second o2's plug instead of the sensor and it tricks the ECU,but I don't know if they are availible in import applications.Someone else may know a better way.

 

[SixtySecondAssassin]

you can splice the wires from the second sensor into the first. your car might run rich or lean.