i got 2 o2 sensor holes on my dseries header but i only got 1 sensor. where can i get the threaded metal plug to plug the other hole at? i have one but i need it to plug the hole in my test pipe..

 

Where are the two holes? If they are in the runners and your car is OBD1 its not going to read right to the ECU for that location. If its after where they merge then I'm pretty sure a spark plug is the same diameter and thread pattern as an O2.

 

Yes a spark plug has the same thread.

FYI I went to NAPA and bought a spark plug tap to re-tap the threads for a O2 bung. They also sell plugs for the bungs.
As well as weld on bungs. Most auto parts stores carry the same stuff.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1992Si &raquo;</TD></TR><TR><TD CLASS="quote">Yes a spark plug has the same thread.

FYI I went to NAPA and bought a spark plug tap to re-tap the threads for a O2 bung. They also sell plugs for the bungs.
As well as weld on bungs. Most auto parts stores carry the same stuff.</TD></TR></TABLE>

This is true, but the other thing is without a cat on the car you will still get that check engine light. There is a reason for the two. One is before and the other after.

 

You can get a plug at any exhaust shop.

 

This is true, but the other thing is without a cat on the car you will still get that check engine light. There is a reason for the two. One is before and the other after.

Sorry to inform you that is not correct. I have two boosted civic's a 92Si and a 93Si both without cat's and neither one has a CEL lite.