I have a '98 E300 with 137,000 miles on it. Last night I got a check engine light, Engine Electronics. The car starts alright (there is no rough start), but after it starts the glow plug light comes on as well as the check engine light. I went to Auto zone and they got a "Code PO380 indicates a fault in the Glow Plug/Heater electrical circuit 'A' for a predetermined period of time" and recommended "replace glow plug[s]."

I haven't had time to check the glow plugs with an ohm meter. My question is, can I drive the car for a while before I tend to this? I am concerned that the glow plug light comes back on and stays on after I start the car and while it is running.

Also, is there anything besides bad glow plugs that can cause this?

I have owned the car for more than 9 years and changed the glow plugs once myself. I know what's involved; the intake manifold is a bear.