What Causes the Engine Yellow Light to Illuminate and the Throttle to Lose Power?

[SilasLynn]

Here are the related reasons: 1. Oxygen Sensor Malfunction: To ensure complete combustion of the engine's air-fuel mixture, enhance engine power, and reduce harmful emissions, the ECU uses the oxygen sensor to detect the oxygen concentration in the exhaust gases and adjust the fuel injection accordingly, maintaining the optimal air-fuel ratio. If the oxygen sensor fails and the ECU cannot receive oxygen concentration data, the engine warning light will illuminate, accompanied by symptoms such as sluggish acceleration (lack of throttle response) and increased fuel consumption. 2. Throttle Position Sensor Malfunction: The throttle position sensor, also known as the throttle opening sensor, detects the engine's operating conditions and relays this information to the ECU. The ECU then adjusts the fuel injection or cuts off fuel supply based on the specific conditions. If the throttle position sensor malfunctions, the ECU cannot accurately determine the engine's operating conditions and make necessary fuel adjustments, leading to symptoms like unstable idle speed and sluggish acceleration.