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Looks like a false air leak. Really need to read the O2 at the wire under the passenger side carpet. Should have a 0.000 to 0.990 voltage reading on a DVM .
Key on, engine off should read 0.500 or there abouts.....this is ecu reference voltage.
With engine running and warmed up, you need to see a swing of around 0.025vdc to 0.890vdc with a new sensor.
In reality the reading will be 0.250vdc to 0.890 vdc at idle.
There is an idle valve on the 190e that has a hose from the intake to the IAV and it is underneath the intake runners. These split or get blown off.
Put your hand under the intake from the distributor end and feel for a fat hose to the IAC....often you'll find it displaced or split.
Part # is A102 094 48 83.
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