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2003 Lincoln Navigator with Error Code "C1991" and says "Module Calibration Failed" +

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Posted by: jmurda11226

Hello,

I have a 2003 Lincoln Navigator and It has the "Check Suspension light on the dash. I took it to the mechanic and he put it on the module and error code "C1991" came up and it said: "Module Calibration Failed." The mechanic replaced the height sensor and the solenoid was also replaced. The "Check Suspension" still remains on the dash.

What is this code and how can this problem be fixed?

My suspension seems to be working because my SUV raises and lowers itself whenever it needs to. The compressor is working.

Thanks in advance

Posted by: Frat-man-du

Don't think the sensor or solenoid are the cause of this error code.

Did he perform the diagnostic test based on the error code, or just replaced parts? I am not familiar with this code and cant comment on the actual procedure to follow.

Did he clear the code when he was done? This is a strange one.

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