DTC U1400: Dynamic range error APS1: Diagnosis
WARNING: This page is about a different car, the 2004 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
Check whether the MFI system sets either of diagnostic trouble code Nos. P2138, P2122 or P2123, and repair if necessary.
(Refer to HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODE ).