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I've not understood this for ages but am now pretty sure CIS-E (KE Jetronic) is jetronic using an EHA type valve for adjustment - which is electronic. Plain CIS (K Jetronic) uses a warm up regulator like the old 450SLs amongst others.
With that cleared up, I have KE (precisely, upgraded to KE III for the 2.5-16 according to the brochure whatever that means) but it's without O2 sensor. This is completely normal for almost all 16vs in the UK and europe. In UK there was no requirement for catalytic converter until 1993 so the 2.5 doesn't have one and they decided not to put a O2 sensor on it either. These days you wonder why however I'm sure it made sense then.
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