Engine light

Yellow engine light on dash came on;
I've replaced:
mass air flow sensor;
PCV valves and all tubing and
camshaft sensor;
engine light then goes off momentarily then comes on showing "code 1388 full code not found in data base"
Why is it still on and how do I turn it off?
I've replaced:
mass air flow sensor;
PCV valves and all tubing and
camshaft sensor;
engine light then goes off momentarily then comes on showing "code 1388 full code not found in data base"
Why is it still on and how do I turn it off?
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