This is not a specific fault code, but a *symptom* of an underlying issue. The causes can be numerous, including:
* Throttle Position Sensor (TPS) problems: A faulty TPS can provide inaccurate information to the PCM about throttle position, leading to reduced power.
* Mass Airflow Sensor (MAF) issues: The MAF sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can cause inaccurate fuel mixture calculations, resulting in reduced power.
* Crankshaft Position Sensor (CKP) problems: This sensor tells the PCM where the crankshaft is in its rotation. A bad CKP sensor can cause misfires and reduced power.
* Camshaft Position Sensor (CMP) problems: Similar to the CKP sensor, but for the camshaft.
* Low fuel pressure: Insufficient fuel pressure can limit engine power.
* Faulty ignition system components: Problems with spark plugs, ignition coils, or wiring can also trigger the light.
* Oxygen sensor (O2 sensor) malfunction: An O2 sensor that is failing can send inaccurate data to the PCM about the air/fuel mixture.
* Problems with the catalytic converter: A clogged or failing catalytic converter can restrict exhaust flow and trigger the reduced power mode.
* Vacuum leaks: Leaks in the intake system can disrupt air/fuel mixture.
What you should do:
1. Don't ignore it: Driving with the "Reduced Engine Power" light on can cause further damage.
2. Get a diagnostic code read: The most important step is to have the code read using an OBD-II scanner. Auto parts stores often offer free code reading services. This will give you a specific trouble code (like P0171, P0110, etc.) that will help pinpoint the problem.
3. Consult a repair manual or mechanic: Once you have the code, you can use a repair manual or consult with a mechanic to determine the cause and get it fixed.
Trying to diagnose the problem yourself without the diagnostic code is difficult and may lead to unnecessary repairs. Get the code read, and then proceed with repairs based on the specific code.
