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Engine light went on. Took car to mechanic who removed the light. Wrote on card ECM 250A, light came on next day. What does this code mean?

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This error code is a result of the engine fuel management system air fuel ratio has adjusted the fuel air trim to the high limit. This is most likely an O2 sensor or less likely a lambda sensor or possible a fuel supply problem.

Each of these components an be checked by a qualified service center. The system has expensive components so I suggest assuring the diagnostics before starting to swap in parts. After market parts are available, however my experience has concluded factory parts from the dealer is the most reliable repair.

Caution is suggested. Even though the car may have no drive ablity problems, a condition can occur that will damage the caltalitic convertor if the fuel air mix is to rich causing the cat to overheat!!

Hope this helps?


Engine light 
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Posted on Dec 14, 2016

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