Hi there,

I have a 2002 Civic Coupe with the keyless entry system.  What
happened several months ago was the keyless entry no longer opened/
closed the driver side door.  It seems still work fine on the
passenger door, so if my passenger side is unlocked and my driver side
is locked, then I can lock the passenger entry using the keyless
entry.  I can also unlock the passenger side using the keyless entry
if the driver side is unlocked.  Finally, I can operate the power
locks on the passenger side with the driver side power lock levers.

At first the problem started occurring and then it suddenly went
away.  Then it started occurring again and it hasn't worked for quite
some time since then.

Any idea how much it should cost to fix something like this, and/or if
it might be easy to fix this myself?

Cheers,
Steve