2014 Ford F-150 3.5L - P0172

This truck came into the shop for the CEL. It runs well at idle, and has a slight hesitation when accelerating from a stop. DTC was set at highway speed (78 mph) and almost 2000 rpms. STFT was at .8% on B1 and -1.6% on B2. LTFT was at -18% on B1 and -12.5% on B2.

Live data shows STFT at 16.4% on B1 and 21.9% on B2. LTFT is at -23.4% on B1 and -20.3% on B2.

O2s are between 125 - 210mV

I feel like I should be looking in the direction of the high pressure fuel system, but this is the first Direct Injection (and twin turbo) engine that I've had the chance to diag.

Thanks in advance for your help!

Odd trim data....

Did you check for fuel in th engine oil?

You may want to shut off the engine after a hot soak and watch the rail pressure, It should rise for quite a while, =>20 minutes. If it does not go uo you may have a leaking inyector/pump.

Under what condition did you record the fuel trim data? I'm assuming @ idle? The LTFT and STFT are virtually cancelling each other out. It's taking the long way around to pull 7% away from B1 if I'm reading that correctly.
I definitely would follow Juergens advice to see if the fuel system is sealed. If that checks out I would have a look at MAF g/ps and see if it's at least reporting close to the engine displacement at hot idle, no loads.

Juergen - Yes, but I could not smell any fuel on the dipstick.

I will definitely start with a hot soak this morning and look at the fuel rail pressure.

Noah - Yes, that data was recorded at a hot idle. I'll take a look at MAF if I get to that point, but I thought this was a MAP engine and the sensors before the intake are basically IAT's???

If that's the case then disregard

I see that you've got a rich code for one bank only, but the long term trims in live data AND freeze frame suggest both banks have an issue. I'd be tempted to look for something that'd impact both banks, instead of just one.

Speaking of MAP sensors, you could always do a quick KOEO rationality check. There's the MAP sensor on the top of the intake manifold itself, and the TCBP on the boost pipe going into the throttle. I sometimes see this sensor called 'Throttle Inlet Pressure Sensor' in scan data. KOEO, they should agree on whatever your local barometric pressure is.

Does desired and actual boost agree under heavy load?