"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]

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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

No way to tell without a scan tool to pull codes.

Probably something like an underperforming O2 sensor....my C240 wagon did that a couple times. Code was slow to heat O2 sensor....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

The above is the first step to take. Anything else is just a WAG.

Duke