"Check engine" light comes on, stays on a week or so. Goes off.

Comes on again, stays on a week or so. Goes off.

Wash, rinse, repeat. Four times in last month.

Any ideas? Should I have tech check it out, or ignore?


(2000 E320, 160K miles]

__________________
62 220sb
67 250S
72 280SE 4.5
74 280C
77 300D
82 240D
85 190E 2.3
86 300E RIP 12/28/09
85 300SD
92 300D 2.5
00 E320 Current
Over 1,000,000 miles in Benzes, Since66

....and a whole passel of BMW 2002 and Tii