When you ask about the CE on later cars, I'm assuming you are asking about the 90 300SE you have listed. As I tried to point out the O2 light on the earlier cars was just a signal tripped by the odometer and had no fuction as an indicator of a problem. The CE on your 300 is turned on by the computer that is tucked away by the passengers right foot. What turns this light on depends on whether your car is a Calif. car or a 49 states car. Since you live in Maryland, I'm assuming you have a 49 state car in which case the light is only turned on by a malfunction of the O2 sensor. If you have a Calif. car, any # of problems in the engine compartment will set a code in the computer and turn the light on. Many of these codes will put the car into limp mode. The only way you will know if a 49 state car is in limp mode is during cold starts. The car will start and die several times and run real bad for awhile during warmup.


Peter

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