I need to replace the HFM-SFI Control Module on my 1994 E320 with 76K miles.

MB Dealer quoted $2200.00.

I would like to repair the unit or buy a used one.

Any suggestions and sources where the ECM can be repaired or purchased used.

According to a TSB, "starting in Jan 1994 and from March 1994, the automatic recognition feature was turned off, so the HTT Tool has to be used for coding the unit. Is there a work around this?

This will solve the HFM code 13 or HTT code 035 Adaptation at limit and Emissions codes 3, 4 and 19.

The car drives fine, but I do not like to see the Check Engine light on. I have had this issue for sometime, but have decided to finally address it.

Wiring Harness, Head Gasket, ACC Control Unit, OVP, Fuel Pump Relay, Plug to coil Connectors, ACC aspirator motor, ACC Interior Temp Sensor, Aux Fans, EGR Valve, MAS etc. have all been changed. 02 sensors maybe next. Is that an easy DIY?

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Zafar
94 E320 58000 Miles