I just had the check engine light (CEL) come on again after haven driven about 600 miles since the last CEL incident. It gave a code 4 on the plug – red light on Diag Mod..
The diagnostic light on the modular plug under the hood on the passenger side of the engine compartment flashed “4” and then I put the home made code reader in pin “8” and got 1 flash…no fault found. When I put it in pin “14” it flashed “11” times. I did this twice to insure the code.
The “11” indicates --
“11 Closed throttle recognition signal to engine control module (HFM-SFI or Left LH-SFI) Fuel safety shut-off to engine control module (HFM-SFI or left or right LH-SFI)”
I believe that my engine contains the HFM-SFI
1995 E320 4dr Sedan W124 6 cyl auto., 90,000 mi.
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What in the world does this mean?

Is it serious?

How do I fix it?

I’ve been told that the O2 sensor usually goes bad.

Should I check the code on any of the other Pins?
I’ve left the code stored so that I can check other pins if necessary.

Thanks for your help

AIR code
Need more info.
Does the pump /clutch come on ????

Yes. That was the first thing I checked after installing the new pump.
I checked by seeing if the pump pulley "triangle" (for lack of a better term) was spinning or stationary when the engine was cold or warm.
It was working and the CEL did not come on for about 600 miles.
Should I check any of the other pins on the 16 I have??
Thanks for the reply

< >>

..so , was it working both cold AND warm ????

sorry, That was a very imprecise answer.
The electromagnetic clutch properly operates when the engine is cold by engaging and does not engage when the engine is warmed-up. I am defintely not hearing any"bad" sounds from the pump area. It appears to be operating properly now. I am not sure what the code 11 means. The posts that I've read asy it means
"Closed throttle recognition signal to engine control module (HFM-SFI or Left LH-SFI) Fuel safety shut-off to engine control module (HFM-SFI or left or right LH-SFI)"
But I'm not really sure what that means is wrong and how to fix it.

OK . We can now continue ..
[ If the pump was working at both temps . as your post indicated, we would go into a completley different diagnosis]

When the clutch is engaged by the ECU, there is also a Switchover Valve that is also energized by the same circuit. This SOV allows engine vac to reach the flow valve between the pump and the engine . It is quite common on these 104s to have a broken vac line going to this SOV. It is the white plastic line in front of the engine, under the front cover . Check that and also check the vac line coming out of the SOV and going to the flow valve.
Report your findings.


The code 11 can be if you had lifted the pedal cable from under the hood when working on the car or the cable could be sticking... see if there is a little play in the cable [ there should be 1/4"] .. erase that code for now.

Just an FYI, I had the same problem with my 94 E320 after changing the head gasket. I know it is possible to inadvertantly switch the vaccum lines which I was careful not to do. The thing I did do though was to accidentally break the vacuum "T" (doesn't actually look like a "T", has 3 vacuum connections) that hooks to the top of the "switch over valve". I bought a new one at the dealer thinking I was done.
After driving the car the CEL came on, I checked the code and got the code #4. After reading this article I checked the vacuum lines to the SOV and for some reason no vacuum at the "T" fitting outlets. All the lines to the T were fine, but for some odd reason no vacuum at the outlets. It turns out I had a defective vacuum "T", there is a piece of hard vacuum line between the 2 outlets on the "T" that was obstructed somehow, I managed to run a small drill bit in the "T" and open the passage way, being careful not to puncture the rubber of the "T". Finally I had vacuum present at both outlets that connect to the SOV and no more CEL problems. I just thought I would pass this along for things to check when the code 4 is present.

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1999 SL500 87K
1994 E320 112K
1998 Ford Ranger - the daily driver 274K and no major repairs (an indestructible truck)
1978 Pontiac Trans Am 110K
1977 Pontiac Trans Am 130K
1999 SL500 87K (the garage queen, only out in the summer)