MKL, Torque doesn’t show any mistakes… funny… does anyone have an idea????

Moin to all moose drivers It’s about a C70 Bj 2003 200hp, LPG in connection with Torque A few days ago the MKL went on. Then I read out the error memory with Torque. I also had an error. Something with mixture exhaust gas bank 1 or something. I didn’t notice the error because then something else came between me. Today I wanted to read out again. Unfortunately, the error is not displayed anymore. The MKL is still on. The connection to the hand Y was given. Does anyone have an idea? Greetings Thomas