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Check Engine Light Question

Robb235

Jet Boat Addict
Messages
145
Reaction score
76
Points
102
Location
Chattanooga, TN
Boat Make
Yamaha
Year
2000
Boat Model
Other
Boat Length
18
If the ECU detects a fault (bad engine temp sensor, for example), does the engine have to actually be running in order for the Check Engine Light to flash on the tachometer? Or can engine be off, but the key on in order for the CEL to flash the fault code?
 
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