My 2017 2.7L F150 (197,000 mi) registered a P0299 (low boost) and a P1702 (intermittent transmission range sensor) code with the wrench dashboard indicator and reduced power.

It clears on restart and is very intermittent (every day or 2). I have previously changed the turbo boost solenoid (about a year ago), but I assume it may have gone bad again. I also relize the range sensor error can be caused by numerous other issues.

Anyone else seen these two together or have any debugging tips?

 

Look up the codes from an official Ford DTC list and read the possible causes.
You will see what you did so far is not close to what the issue can be.
The Trans codes all reflect the same issue and has no relationship to the turbo boost issue.
A second problem that will take more to solve than than the Turbo issue..
Good luck.

 

Well, to follow up, turns out to be a restricted Cat. I thought about what could cause it, since the boost solenoid was already changed and I have 200K on the truck. Tried a can of CAT cleaner and the problem went away for a couple of weeks but then reappeared. A 2nd can of cleaner and the problem has not returned for a month now. Since the code would appear every day or so before the cleaner, looks like this was the problem.

Didn't even know you could clean a Cat before this....