After servicing the cylinder head gasket, the EGR started failing and I was told it was due to its manipulation that it blocked. At the beginning, by simply turning the engine off and starting it again, the error disappeared. But after a while, the indicator did not turn off at all. So, as the EGR is rather expensive, I decided to disassemble mine and clean it. Both its electronic and mechanical parts were checked and, after connecting it again, the indicator turned on once more. It must be that the computer keeps it blocked for its own safety. Does anyone know how to remove the error codes? I've already tried disconnecting the battery for an hour.

My rear tail lights wont turn off even though the keys have been removed and all lights have been turned off I am afraid this problem will drain my battery need advice on how to turn off these lights