As SB has pointed out , there are other diagnostic modules on your car that can be accessed at the different sockets with the aid of a simple led/sw tool. This is OBD1 system and quite good.
The built-in one only accesses the emmisions system one , but
that is the one that trips the CE light...
If you would like a copy of the diagnostic box pin printout,
email me and I will send you one..
A home-made tool is nice to have , as your car is the last flash
code system before OBDII, which requires a scanner..
There are simple instructions for tool in archives [ about $5/parts--RS]