Malfunction, then how long till CEL on - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 10-11-2009, 10:57 AM Thread Starter
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Question Malfunction, then how long till CEL on

How long does a malfunction (P0170 code) have to exist before the CEL turns on? Does it turn on immediately when the malfunction happens? Then after solving the problem but not manually clearing the code, how long till code clears itself? I suppose this answer could be in time, miles, on/offs, driving conditions.
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post #2 of 2 (permalink) Old 10-11-2009, 02:01 PM
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P0170 should appear pretty fast if that problem exists. I do not know how long it lasts after the issue has been resolved, but if you do not have access to an OBDII scanner you could disconnect the neg terminal of you battery for a couple of minutes. The CEL should be turned off when you reconnect it.

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