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Old 12-10-2007, 10:04 PM   #1
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Hi I have a 2008 M8 153, My ECU 23 diagnostic code started to flash. the code is described as a fail safe mode activated in Knock control system. The dealership figured it is fuel that has ethanol in it. I put premium in it but the fuel did have ethanol in it. Did anyone run across this problem or anyone know what it could be?
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Old 12-11-2007, 02:30 AM   #2
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Yeah I did. People on here will tell you to put regular in it, but I wouldn't. Most of those people will be from the states and thier fuel might be a little fresher than ours. I had a code come in that was "knock sensor failure". I shut the sled down when I got home and looked at the manual, once I fired it up again the code was gone and hasn't come back. If the code is still there I would take it in, you have warranty. If the code is gone don't worry about it, that means the code has cleared.
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Old 12-11-2007, 11:07 AM   #3
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Owner's manual recommended 87 Octane where the engine performs the best. Wondering why you Guys didn't follow.
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Old 12-11-2007, 06:30 PM   #4
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Keep in mind that some automotive fuel dryers use ethanol which is not recommended for two stroke motors. You'll want to use a fuel dryer with isopropyl alcohol instead.
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Old 12-11-2007, 10:36 PM   #5
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there are many f8's and m8's probably the cross 800's also that have this code flashing for the '08's. one dude said Cat is working on the problem. safe to ride. doesnt affect performance. nothing to do with fuel. i think its a poor sensor. time will tell what the fix will be. i had it flash ecu 21 twice in 50 miles. only seemed to come on after 2-3 seconds of WOT. shut the sled down and restart and its gone. doesnt come on in all other throttle ranges. who knows... but ride while you can.
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