190E 2.3 (201.028) L4-2.3L (102.985) (1987)
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Maintenance Required Lamp/Indicator: Description and Operation
1984/1985 190E
Legislation prescribes that the oxygen sensor must be replaced once after 30,000 miles or, in the case of Canada vehicles, after 50,000 km. This is
indicated by an "O2 sensor" warning lamp in the instrument cluster lighting up.
The odometer of the speedometer produces a voltage signal via a magnetic field when 30,000 miles (or 50,000 km - Canada) is reached.. The
downstream electronics detects this voltage and switches on the warning lamp.
After the oxygen sensor is replaced, the warning device should be deactivated by removing the bulb. This will require partial removal of the instrument
cluster.
As of 1986-1988 USA Models and Federal Models as of 1991
The failure of an oxygen sensor is indicated by the "O2 sensor" warning lamp (A1e10) in the instrument cluster (A1) coming on (1988 and as of 1991
Federal: inscription "CHECK ENGINE" (A1e26)).
The warning lamp is actuated by the KE control unit, contact 15 (as of 1991 Federal: KE control unit contact 23).
See Computers and Control Systems for Diagnosis and reset procedure.
"CHECK ENGINE" Warning Lamp - USA 1988/As of 1991 California Version
The "CHECK ENGINE" warning lamp (A1e26) lights up if an exhaust system component fails. The warning lamp is actuated by the KE control unit,
contact 23.
See Computers and Control Systems for Diagnosis and reset procedure.
