Service Engine Soon Light

What are some of the possible causes of the Service Engine Soon light indicator to stay on in a Ford Expedition that has 71,000 miles on it. Any info would be appreciated.

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MICHAEL WASHINGTON wrote:

There are *many* causes, too many to list here.
There is no need to guess why the light is on, the car's computer will output one or more trouble codes[1] to a piece of diagnostic equipment, which will help a technician diagnose the root cause of the problem.
[1] The computer also outputs a huge amount of data in real time, showing the operating parameter of the engine control system, which further helps a qualified technician to diagnose and fix whatever is wrong with the powertrain.
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I think the truck's emissions warranty goes to 80,000 mi. This should be covered by it. Read your emissions warranty. If it goes to 80,000 mi, you are covered.
Jeff
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MICHAEL WASHINGTON wrote:

question. It couls be anything from a misfire to a bad sensor to the sky is falling. Take it in to a shop and let them break out the code reader.
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