Where can I find check engine light codes for my '90 740 GLE? It is coming up with a 212 reading when I plug into number 6 in the diag box.
The car will run like it is missfireing and it has a new tune up on it. Could it be the O2 sensor?
Thanks.

http://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm
There's a list of the codes for ya .
Wiring fault to heated O2S sensor.

Here is a topic about this code. Maybe you can ask the tread starter how they fixed the problem.
http://forums.turbobricks.com/showthread.php?t=15757&highlight=2-1-2