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E4 means your Ambient air temperature sensor is open/bad. It is located above and to the right of the a/c condensor core behind the front bumper. Other possible causes are shorted wiring to the sensor or a bad ground.

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โˆ™ 2004-06-27 00:10:04
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Q: What does E4 repair code mean on a 1991 Ford Thunderbird with electronic climate control?
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