My '94 E320 Wagon displayed the Check Engine Light. I used the code checker that I built to display the codes and to see if the warning was real, I erased them and finally used the built in "button" on the 16 pin DTC to turn off the Check Engine Light, which it did.
About a day later, the Check Engine Light came back on, but when I did a code check, I only got one flash on both pins, which means that no codes were stored.
Any ideas as to what is causing the light to come back on and how do I finally turn it off would be greatly appreciated.

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