Noisy Air Pump - replaced Check Engine Light
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Originally Posted by Arthur Dalton
I can't answer that without info.
If one knows what codes a CE AIR code is coupled up with from Engine Mangement , then one can make a conclusion.
An AIR code on led/sw simply means it is possible the 02 sesnor has not detected a very lean condition during self test...........so, is the 02 sens capable of a the very low required spec for self test ??? Don't know that yet...........
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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?
Ive been told that the O2 sensor usually goes bad.
Should I check the code on any of the other Pins?
Ive left the code stored so that I can check other pins if necessary.
I hope this provides enough information.
Thanks for your help