Segunda Generación del Ford Focus

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Why did engine light come on?

The engine light came on but the car is running good and engine oil is topped up.

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Carol O'Brien, there can be plenty of reasons for that. Something as simple as a bad gas cap to pretty much any sensor, could have caused that. I suggest to get it scanned for any OBD codes. Not sure where you are located, but Autozone and other parts places offer free scans. Let us know what you find.

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Hi,

i had a bad air flow sensor, but my engine still comes on after a new air flow sensor was put in, trying to find answer what could cause it to idle real low and engine light come on

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Its your pcv valve and hose I replaced the maf in mine but light remained on. I then replaced the pcv valve and hose due to it was cracked open and wasn't getting enough vacuum. The pcv valve and hose are located behind the air intake its a pretty involved job if everything goes smoothly should take about 45 min to do.

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did you reset the MIL ?

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Carol O'Brien estará eternamente agradecido.
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