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So my car has about 103k miles, bought at 90k and maintained through it's lifespan thus far. I have recently had an issue with my throttle pedal going completely dead while driving the car under the equivalent load to passing someone. The pedal sinks to the floor, the car jolts one time and the throttle goes dead. It will hold itself at about 3k rpm with the pedal fully depressed but will not go any higher than that. Blipping the throttle does nothing either, eg. No response. The only solution I have found is to turn the car off and back on while in motion (6-speed)
I have also noticed that you can hear what sounds like pressurized air being forced through the engine bay at an increasing volume level until it peaks and the pedal goes dead. I replaced (see attached photo) this sensor as recommended on another thread. To my knowledge, the only CEL is Turbo Under Boost. Don't remember the code. Anyone know more than me about turbo systems? I am still under the impression that it is a boost leak and that the engine is putting itself into a "limp mode" of sorts to prevent harm to the engine, hence why the pedal comes backs after cycling the ignition?
 

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28 - DTC-Based Diagnostics / MODULE, Powertrain Control (PCM) / Diagnosis and Testing

P0299-00-TURBOCHARGER UNDERBOOST CONDITION
Rectangle Slope Font Parallel Number

Theory of Operation

The base Turbocharger boost pressure is managed by the mechanical Wastegate. The Wastegate is a mechanical valve that, when opened, allows exhaust gases to flow around the turbine. The Wastegate is spring loaded in the closed position. Boost pressure is applied to a diaphragm that works against the spring pressure of the Wastegate. When the force created by the boost pressure exceeds the spring force in the Wastegate, the valve opens. This limits boost pressure by limiting the speed of the Turbocharger. Boost pressure is applied against the spring pressure of the Wastegate to control the speed of the Turbocharger. The Wastegate Solenoid is Pulse Width Modulated (PWM) by the PCM and is located between the compressor and mechanical Wastegate. When opened by the PCM, the Wastegate Solenoid bleeds boost pressure away from the mechanical wastegate, this allows the PCM to increase boost pressure to a level higher than would be allowed by the mechanical wastegate alone. The system operates as follows; boost pressure is supplied to the Wastegate Solenoid through a hose connected to the compressor side of the Turbocharger. The Powertrain Control Module (PCM) varies the PWM signal to the Wastegate Solenoid to control the amount of boost pressure applied against the Wastegate. When more boost pressure is needed, the Wastegate Solenoid will direct more of the boost pressure to the clean air tube upstream of the Turbocharger and less against the Wastegate spring.

When Monitored and Set Conditions

When Monitored: This diagnostic runs continuously when the following conditions are met:

•With the engine running.
•DTCs P0033, P0034, P0035, P0237, P0238, P0299, P006C, P006D, P012B, P1185, P2261, P2262 are not present..

Set Conditions:

•The PCM detects that the difference between the Boost Pressure Sensor desired value minus the actual reading is above a calibrated value for the driving conditions.

Default Actions:

•MIL light will illuminate.

Possible Causes

RESTRICTED AIR FILTER
BOOST SYSTEM PRESSURE HOSES RESTRICTED OR LEAKING
SMALL INTAKE SYSTEM LEAK OR RESTRICTION
EXHAUST SYSTEM RESTRICTION
WASTEGATE SOLENOID
WASTEGATE VALVE STICKING
TURBOCHARGER (DRAGGING TURBINE)
 
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