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Old 06-04-2008, 12:55 AM
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Join Date: Apr 1999
Posts: 2,637
1995 W124 E320 wagon Check Engine codes 2, 6, 17

The "CHECK ENGINE" light illuminated on our 1995 E320 wagon with ASR (HFM electronics).

The vehicle has the 16-pole Diagnostic Connector with an LED.

I pulled the following number of blinks:
2, 6, and 17

I have two manuals for both analog and digital fault codes for the HFM M104 engine.

Which one do I use to decipher (analog or digital) ?

If analog:

2 = Engine coolant temp. sensor
6 = Not Used
17 = Injector, Cylinder

If digital, do I use the "OB15" or the "MB" key:

2 = engine coolant temperature sensor, open circuit
6 = hot film air mass sensor signal too high
17 = ISC (idle speed control) at upper control stop area, malfunction

002 = engine coolant temperature sensor, short circuit
006 = intake air temperature sensor, short circuit
017 = throttle valve potentiometer drive value implausibly high

:-) neil

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Old 06-04-2008, 01:37 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
None of those codes are correct for the built-in Led/sw. [ Diagnostic Module]
Those are HFM codes , not DM codes.

Here are the correct ones and you then want to get the ones from pins 8 and 14 to see what they couple up as with the DM.
You will need the tool for those.

E320 16 PIN DTC Charts inc. pin 8, pin 14

A Dalton

Last edited by Arthur Dalton; 06-04-2008 at 11:43 AM.
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