Hi Scotty. I got 2010 prius with 360k km and P3190 came up - low engine power. 

I change all possible thing sugessted on forums and you tube, checking for vacuum leaks, cleaning first than replacing MAF sensor, cleaning throttle body, replacing watter pump, cleaning EGR and cooler, cleaning air intake menafold, replacing MAP sensor, camshaft and crankshaft sensor... Head gasket was put 3000km before that code, could that job gone wrong. 

Official workshop did not fine anything, they could start putting engine appart, but I do not trust them that much.

Here is freeze frame:

02 DTC that caused freeze frame data Trouble Code P3190 triggered Freeze
Frame. Code Def - Poor Engine Power
03 Fuel System Status Open loop due to driving conditions
(Bank 1 or both) (e.g. power
enrichment, deceleration enleanment,
cylinder deactivation)
04 Calculated Engine Load Value 94,9 %
05 Engine Coolant Temperature 6 °C, 43 °F
06 Short Term Fuel Trim Bank 1 0,0 %
07 Long Term Fuel Trim Bank 1 0,0 %
0B Intake Manifold Absolute Pressure 87,0 kPa, 25,7 inHg
0C Engine RPM 1232 rpm
0D Vehicle Speed 0 km/h, 0 MPH
0E Timing Advance for #1 cylinder 10,5 °
0F Intake Air Temperature 10 °C, 50 °F
10 Mass Air Flow Rate 10,79 g/s, 1,43 lb/min
11 Absolute Throttle Position 23,5 %
15 O2 Bank 1 - Sensor 2 - Short Term Fuel Trim 99,2 %
15 O2 Bank 1 - Sensor 2 - Oxygen Sensor Voltage 0,195 V
1F Run Time Since Engine Start 18 seconds
24 Wide Range O2S: Bank 1 - Sensor 1 - Equivalence
Ratio
1,232 λ
24 Wide Range O2S: Bank 1 - Sensor 1 - Voltage 5,000 V
2C Commanded EGR 0,0 %
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PID Description Value
© BlueDriver 2019
Freeze Frame Report - Unknown
2E Commanded Evaporative Purge 0,0 %
30 # of Warm-ups Since Codes Cleared 0 #
31 Distance Traveled Since Codes Cleared 0 km, 0 mile
33 Barometric Pressure 101 kPa, 30 inHg
34 Wide Range O2S: Bank 1 - Sensor 1 - Current 1,609 mA
34 Wide Range O2S: Bank 1 - Sensor 1 - Equivalence
Ratio
1,232 λ
3C Catalyst Temperature Bank 1 - Sensor 1 91,9 °C, 197,4 °F
3E Catalyst Temperature Bank 1 - Sensor 2 14,9 °C, 58,8 °F
42 Control Module Voltage 14,687 V
43 Absolute Load Value 49,0 %
44 Commanded Equivalence Ratio 0,817 λ
45 Relative Throttle Position 5,1 %
46 Ambient Air Temperature 0 °C, 32 °F
47 Absolute Throttle Position B 56,9 %
49 Accelerator Pedal Position D 0,0 %
4A Accelerator Pedal Position E 0,0 %
4C Commanded Throttle Actuator 23,5 %
4E Time since Trouble Codes Cleared 6 minute