Hello Folks
I drive a Honda civic 1998 LX - Few days back my check engine light
turned on

I took it to the dealer. He supposedly did some checks and said that
the code maps to a top dead center (tdc) sensor problem (probably
related to the distributor). He was not sure about this and said that
he didnt have sufficient data to suggest doing anything. He reset the
light and I had my car back.He charged 90+ bucks for the entire
process which took less than an hour
Next day I see the light go on again. This is kind of frustrating
,given that I had paid fair amount of money for diagnostics and had
spend ample time commuting to the dealer in the midst of a busy day

Question
1. What are my options? Better Business Bureau? This is not my first
experience (mis-diagnosis that is) with this guy.
2. Under these circumstances can i ask for a refund for this and take
it to another mechanic? Am i "eligible" for a refund?
3. Is it OK to the dealer to charge me yet again saying that initially
he was unable to detect the problem based on the code?
4.As far as I am concerned the mechanical problem in as much is an
orthogonal issue - but any inputs will be useful regrding the problem
per se

Background:

I have been going to the same honda dealer for all my car service
needs;In fact I had serviced last month - 60K. I have been doing my
service @ regular intervals-as per the manual.

Thanks much - in advance
John