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Check Engine Light Question

Thread starter Robb235
Start date Apr 3, 2021

Robb235

Jet Boat Addict

Apr 3, 2021

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?