CEL code 400

[rajp53]

The diagnostic code reads 400. What's it mean? Loose gas cap?

 

[X-Eliminator]

The diagnostic code reads 400. What's it mean? Loose gas cap?

You didn't say what year, make, and model.

WTF is a CEL code ?
If you are asking for the DTC code (P0400), it's "EGR Flow Malfunction".

 

[The Vodkinator]

CEL = check engine light. Problems will throw a cel (ala not running all your cats in a WRX).

Jen
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