So from what I've gathered I should be seeing a Check Engine light and be able to pull a code if a glow plug is bad....I was wondering, are the electronics in these W210s very reputable? I've had no major problems but once or twice it gave me false low-oil-level readings or ABS failure warnings, etc. I'm just not sure if I should trust the computer to tell me if a plug has failed, just like I wouldn't trust a computer to tell me my oil level is low if the motor has no dipstick (new CDIs, etc.)
It certainly would help not to have to remove the intake to diagnose a blown GP but there isn't a way to tell for certain without removing it.....
