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The CHECK ENGINE or SERVICE ENGINE SOON dashboard warning lamp is referred to as the Malfunction Indicator Lamp (MIL). The lamp is connected to the engine control assembly and will alert the driver to certain malfunctions within the EEC-IV system. When the lamp is lit, the ECA has detected a fault and stored an identity code in memory.
Does it say "check engine" or "service engine soon".
This is just a timer and is called the "extended useful life" sensor, on my truck is up under the dash above the steering column near the chime.
Just another reason to get your truck in to the dealer for a service and inspection.
It can be reset by depressing a button with a pointy tool.
Let me see if I can find my post, or do a search for yourself.
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