Hi,

My faithful 1994 Civic EX has nearly 140K miles. It runs great but the check
engine* light has been coming on recently, randomy. Sometimes I'll go
through my 5-mile commute without a flicker, but sometimes it comes on after
1-2 minutes.

* The light on the dashboard that has a little yellow picture of what looks
like an engine, I assume this is the check engine light.

Anyone know what inputs cause this light to go on?

Thanks
John