Ok. Now something weird is going on. My check engine light has been on due to me using only one o2 sensor which is normal. But now my speedometer isnt working right. It moves when car is just idle'n. It jumps from 0 to 50/60/70mph while idle'n. Have you ever heard of such a thing? It also doesnt...
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
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