Quote:
Originally Posted by Frank Reiner
MB gasoline engines delivered in the US from 1981 onwards have been equipped with either K-Lambda (81-85) or KE (86-91). Both versions have exhaust O2 sensing and feedback control of mixture to provide a stochiometric mixture to the catalytic converter.
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500SEL is not a US-spec car. OP never said where they are either, this may not even be a US poster. If they are in the US, it would have had to be converted to have the Lambda feedback circuitry. Assumptions can get you in trouble.