I am getting the following blinker codes from my 16 pin diagnostic box on a late model (Nov '95) W124.088 M104942 engine (ca. 138k miles):
Socket 8 HFM-SFI Sequential Injection/Ignition:
9 = O2S 1 (before TWC) - voltage too high, circuit open or voltage implausible.
Mercedes-Benz Servicing, repairs, engine and diagnostics Wayne Gates - Mercedes-Benz, Unit F3, Phoenix Industrial Estate, Rosslyn Crescent, Harrow, Middlesex, HA1 2SP Tel: 020 8863 9233 Established for 20 years all vehicles washed and vacuumed.