What Causes the Leiling to Display a Fault Prompt for Reduced Engine Power?

[McElisa]

There are several reasons why the Leiling may display a fault prompt for reduced engine power: 1. Electrical Faults in the Engine: These faults include damage to certain sensors, such as the air flow meter, throttle idle motor, oxygen sensor, ignition coil, spark plug, coolant temperature sensor, crankshaft position sensor, or camshaft position sensor. Additionally, they may involve some control units or actuators, such as the engine control unit (ECU), ignition control unit, fuel pump, or camshaft adjustment solenoid valve. Apart from these electrical components, the fault could also be caused by the wiring between these parts. 2. Mechanical Faults in the Engine: For example, changes in fuel quality, using fuel with excessive additives, or carbon buildup covering the intake tract, throttle, or spark plugs. Additionally, air leakage in the intake tract below the standard value can generate corresponding fault codes. In severe cases, the engine fault light may also appear on the dashboard.

[DeJesse]

I've encountered the issue of the Levin displaying reduced engine power several times, usually due to a dirty or clogged throttle body. When the ECU detects insufficient air intake, it forces a speed limit to protect the engine. Sometimes, it's also caused by an aging fuel filter clogging the fuel supply, leading to low pressure and a sudden drop in power. Don’t underestimate this issue—driving with it for a long time may damage the engine or even cause more serious failures. It’s recommended to regularly clean the throttle body and replace the fuel filter, preferably checking every 20,000 kilometers. If the warning appears, pull over first and check the dashboard for any other alert lights. If it persists, go to a 4S shop immediately to read the fault codes—don’t delay until it becomes a major repair.

[Noah]

As someone who frequently tinkers with cars, I've found that reduced engine power is often caused by sensor issues. For example, a malfunctioning mass airflow sensor sending incorrect data or an aging oxygen sensor causing the ECU to misjudge the air-fuel ratio. It could also be due to weak sparks from faulty ignition coils dragging down performance. These small components are prone to failure from dust accumulation and corrosion, especially becoming more noticeable in older Corolla models. I recommend directly connecting a diagnostic scanner to read specific trouble codes and pinpoint the issue, while also cleaning sensor connectors to prevent poor contact. It's good practice to check if the air filter is clean before driving to avoid triggering protective measures due to insufficient air intake.

[SanTimothy]

Money-saving tips: When driving my Levin, similar warnings often appeared due to reduced fuel pump pressure or spark plug carbon buildup causing power loss. Replacing spark plugs is inexpensive, costing just a few dozen yuan, which is more cost-effective than letting it escalate into significantly increased fuel consumption. Check if the battery voltage is stable, as voltage fluctuations may cause the ECU to mistakenly limit speed. Don’t overlook simple self-checks, such as observing whether the throttle response is sluggish or if acceleration feels weak. These small details can help quickly pinpoint the issue, saving money and avoiding costly engine repairs.