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Here's a copy of the invoice, I can't make sense of what's written about the codes.

KOEO (Key On Engine Off) 232, Primary coil circuit failure. 341, Octane jumper installed. This is to let you know Octane booster was installed.

KOER (Key On Engine Running) 411 and 412, Idle speed system not controlling idle speed correctly.

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10y ago
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19y ago

It goes into closed loop mode, and one of the sensors is not inputting the info the PCM needs.

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Q: Why does a 1992 Ford Explorer XLT suddenly start chugging and the check engine light comes on after running good for 15 minutes?
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