Tundra Hybrid Manifold Pressure Sensor Fault

Your symptoms strongly suggest a manifold absolute pressure (MAP) sensor issue, especially given the error codes you are likely observing. A large vacuum leak, as you suspect, could indeed be the root cause, skewing the sensor readings. Have you inspected the vacuum lines connected to the intake manifold for any visible cracks, disconnections, or general degradation? Also, examine the sensor's electrical connector for corrosion or loose wiring. Disconnecting and reconnecting the sensor might provide a temporary respite if the connection is poor, but I wouldn't consider that a fix.

Regarding the vacuum lines, are there any particular areas of the manifold or specific hose routing configurations that are known to be more susceptible to failure on this generation of Tundra hybrids? I plan a more detailed inspection, and guidance on common weak points would be great.

Focus on areas near heat sources and bends in the hoses. The line running from the manifold to the brake booster is a frequent offender, as is the PCV valve hose. Given the symptoms and your efforts, the fault likely resides within the sensor itself or a significant leak that requires specialized diagnostic tools (smoke test, for example). Consulting a qualified technician for a thorough diagnosis and repair would be wise.

Following your recommendation, I brought the vehicle to a trusted workshop. The issue was traced to a faulty manifold pressure sensor, made worse by a minor vacuum leak in one of the aging hoses. The sensor was replaced, and the hose was repaired, costing 235€. The vehicle's performance has been restored.