This bulletin applies to 2014-2015 Acura MDX vehicles. The MIL may be on, with DTC P0134 (rear A/F sensor bank 1, sensor 1; heater system malfunction) and/or P0154 (front A/F sensor bank 2, sensor 1; heater system malfunction). The PCM misinterprets the heater system input from the A/F sensor and sets DTC P0134 and/or P0154.

Update the PGM-FI software. The MVCI control module update: application version 3.01.40 or later. HDS software version 3.015.033 or later. Before beginning the repair, make sure that both HDS and the MVCI are updated.

2014-2015 MDX 2WD base, Tech, Tech with Entertainment:

Program ID J6A590 or later; Program P/N 37805-5J6-A59 or later

2014-2015 MDX 2WD Advance with Entertainment:

Program ID J6A680 or later; Program P/N 37805-5J6-A68 or later

2014-2015 MDX SH-AWD Base, Tech, Tech with Entertainment:

Program ID J6A780 or later; Program P/N 37805-5J6-A78 or later

2014-2015 MDX SH-AWD Advance with Entertainment:

Program ID J6A880 or later; Program P/N 37805-5J6-A88 or later