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P0299 Underboost

ShadowFox

Well-known member
First Name
Mac
Joined
Nov 24, 2021
Threads
6
Messages
150
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150
Location
Houston
Vehicles
2007 Eddie Bauer Expedition, 2016 Mustang GT
Occupation
USAF
Looking for some help tracking this code down, I recently upgraded and relocated my IC, changing from recirc BOV to venting to atmosphere, under med-high boost settings the service now warning comes up and I lose a bunch of power and get the underboost code.
Is this something that can be fixed with a tune to compensate for the different BOV orientation, or larger amount of air?

I did a few brake boosts and didn’t hear any leaks—all the piping was torqued down to spec. It’s possible I messed up the BOV removing/installing it but I’m trying to exhaust other options as I would need to remove the bumper/winch to access the BOV now.

Ford F-150 P0299 Underboost IMG_0543
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