The P0191 trouble code indicates a problem with the Fuel Rail Pressure Sensor (FRP) signal or performance.

This sensor monitors the fuel pressure inside the fuel rail and sends data to the engine control module (ECM). The ECU uses this information to control fuel injection and engine performance.

When the ECU detects that the fuel pressure signal is outside the expected range or inconsistent, it triggers the code:

P0191 — Fuel Rail Pressure Sensor Range/Performance Problem.

This issue can affect engine power, fuel delivery, and overall drivability.

A firmware package designed for chip tuning the Siemens Simtec 76 Chevrolet Cruze ECU.

FIAT TIPO MK3 1.4 T-JET MOTORIZZAZIONI - SOSPENSIONI - CARROZZERIA - IMPIANTO ELETTRICO - CLIMATIZZAZIONE.

Diagrama y Manual Ford Cargo 1722.

The P0221 trouble code indicates a problem with the Throttle Position Sensor (TPS) circuit range or performance.

Modern vehicles use electronic throttle control systems to regulate engine airflow. The throttle position sensor tells the engine control module (ECM) how far the throttle plate is open.

When the ECM detects that the TPS signal is outside the expected operating range or behaving inconsistently, it stores the code:

P0221 — Throttle Position Sensor Range/Performance Problem.

If ignored, this issue can lead to poor throttle response, reduced engine power, or limp mode activation.

A firmware package designed for chip tuning of DELPHI MT20U, MT20U2, MT22U ECUs.

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The P0122 trouble code indicates that the engine control module (ECM) has detected a low voltage signal from the Throttle Position Sensor (TPS).

The TPS monitors the position of the throttle plate and tells the engine computer how much the driver is pressing the accelerator.

When the signal voltage drops below the expected range, the ECU stores the code:

P0122 — Throttle Position Sensor Circuit Low Input.

This issue can affect engine performance, throttle response, and acceleration.

A firmware package designed for chip tuning Korean KIA, HYUNDAI with Bosch 7.9.7 ECU.