Does the check engine light goes off by itself when the problem is solved or it needs to be reset. Can i reset it myself?

Dmitry
90' 300CE

On federal version 1990 300CE you must have scan tool (analog pulse counter). On the Calif. version there is a reset button on diagnostic connector. Procedure is simple.

I think i have a california version.
The car was bought and driven for first 3 years in San Diego area.
What is the precedure than? I already had paid 20$ to my tech to do the diagnostics, it seems to be a bad air censor (I am requesting this part now) and if i can reset this myself, than i don't even have to go back to the tech.
As always this site is amazing ( I can't belive its free :) ) Thanks

Dmitry
90' 300CE

Hey guys ! Can any one tell me what this precedure is? There is a litle buton there, on the diagnostic unit. I pressed it several times an the red light next to it was led every time i did it. Nothig happened to the "Check engine" light, it is still on. Is there a cirtain secuence to this? Please help

Dmitry
90' 300CE

Turn on and start engine.
Push button for 3 seconds, count flashes and record. Repeat untill the same code comes out.

Push button for 8 seconds to erase the code. Push for 3 seconds to get out the next one, then 8 to clear....

You must turn off the engine for 15 seconds and wait. Then restart to see if light is off. IF part is failing constantly, it will not erase.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope :)
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Do diesels have this function?