Codes 2783, 27FF, 28AA
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Neutral
Joined: Jan 2020
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From: Norther California
Codes 2783, 27FF, 28AA
So I have a 08 mcs with 122k, Im getting a 2783, 277F and 28AA codes. In the past 12 months I've replaced the fuel filter, fuel injectors, HPFP, all the coil packs, spark plugs and have done a carbon blasting. Ive hit a wall with these codes and have no idea where to go next. Any helo would be greatly appreciated
6th Gear
Joined: Mar 2011
Posts: 1,945
Likes: 203
From: Northern NV
My 28AA is caused by a faulty diverter valve. Specifically, an external BOV connected as a DV, but connected in the wrong places. I'd suggest replacing your DV with one of the aftermarket versions from one of our NAM vendors. Might even help with the misfire codes.
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