95 Corolla check light? how to diagnose?

Hi
I have a 1995 corolla with 115k miles on it.
The check (engine) light on the dashboard stays on all the time. Does
anyone know how I can troubleshoot and find out the meaning of the
code?

I did check the 02 sensor wires on the header and connector on the fan
shroud, those look good. gas cap was secure, as I heard vacuum as
well.

Thanks!

-joe

Go to Autozone and they will check the code for free. Post the code here
and then someone can help you.

-hbuck

Ok, I checked some more and I found the diagnostics port on the drivers
side engine bay.
I shorted TE1 and E1, and I got the check code 21

Is that the o2 sensor? Is it a safe bet to replace it?
I also disconnected the battery, and I'll make sure the same code comes
back.

I also learned there is 1 o2 sensor in the header(i can see that behind
the radiator) and I think there is one on the downpipe(i still have to
crawl under).
If there are 2 o2 sensors, how do I know which one is bad?

Thanks!!

[email]g20joe1@gmail.com[/email] wrote:[color=blue]
> Ok, I checked some more and I found the diagnostics port on the drivers
> side engine bay.
> I shorted TE1 and E1, and I got the check code 21
>
> Is that the o2 sensor? Is it a safe bet to replace it?
> I also disconnected the battery, and I'll make sure the same code comes
> back.[/color]