can you pull the OBD-II Codes if the engain light is not no - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 10-26-2009, 12:16 PM Thread Starter
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can you pull the OBD-II Codes if the engain light is not no

I was told by the local advance auto parts store that you can't pull the OBD-II Codes if the engine light is not on is that right
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post #2 of 5 (permalink) Old 10-26-2009, 12:47 PM
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I was told by the local advance auto parts store that you can't pull the OBD-II Codes if the engine light is not on is that right
If you are refering to the "check engine light" or similar, not entirely true. If the light is not on, it means no codes have been set that require activating the "check engine light". However, many vehicles do set "pending codes" or codes that do NOT activate the check engine light. If these are set most, if not all, OBD-II readers should be able to read pending or other codes.

Examples of a "pending code" may be engine misfire detected, but not long enough to set a code.

Examples of codes that don't set the "Check engine light" are "EGR malfunction" on my 04 Non- California diesel truck. The code will get set and can be read, however for 49 state vehicles, it won't trigger the "check engine light"

If you have a conditon that sets the "check engine light" and then goes away, he is likely correct in that you may not be able to read the code that was set in the first place.


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post #3 of 5 (permalink) Old 10-26-2009, 02:22 PM Thread Starter
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i have a 1997 c280 "check engine light in not on, but my car cranks but wont started, and dont wont to buy a OBD-II readers if there no codes to read,you say that there could be code that don't set the "Check engine light" so i should get then
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post #4 of 5 (permalink) Old 10-26-2009, 03:24 PM
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CEL indicate problem with engine emission and to my knowledge can be only set when the engine is running.
If your engine will not start, this is mostly due the fuel delivery problem, or bad CPS.
None of those triggers a code, than not having a scanner you are not sure.
Since the scanners are way cheaper than dealer's charge for one tome scanning, this is no brainer to me if i should own one.
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post #5 of 5 (permalink) Old 10-26-2009, 05:02 PM Thread Starter
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thanks
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