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2000 Toyota RAV4 the check engine light came on and car shakes slightly seems to loose power what could be cause?

There are several potential causes for a check engine light and a shaking car with a loss of power in a 2000 Toyota RAV4. Here are some possible reasons:

1. Misfiring Engine: A misfiring engine can cause the vehicle to shake and lose power. This can be caused by a variety of issues, such as faulty spark plugs, ignition coils, or fuel injector problems.

2. Faulty Oxygen Sensor: A faulty oxygen sensor can provide incorrect readings to the engine computer, which can affect the air-fuel mixture and cause the engine to run rough and lose power.

3. Catalytic Converter Issues: A clogged or damaged catalytic converter can restrict exhaust flow and cause the engine to run poorly, leading to shaking and power loss.

4. Transmission Problems: Transmission issues, such as low transmission fluid or a faulty transmission sensor, can cause the car to shake and lose power.

5. Vacuum Leak: A vacuum leak can disrupt the proper air-fuel mixture, causing the engine to run lean and resulting in shaking and power loss.

6. Fuel System Problems: Issues such as a clogged fuel filter, a faulty fuel pump, or injector issues can disrupt the fuel supply and cause the engine to shake and lose power.

7. Engine Control Module (ECM) Issues: The ECM is responsible for controlling various engine functions and a malfunctioning ECM can lead to a variety of issues, including shaking, power loss, and a check engine light.

To pinpoint the exact cause, it's recommended to have a professional mechanic diagnose the issue using a code scanner to retrieve any trouble codes stored in the car's computer. This will help identify the underlying problem, allowing for appropriate repairs or maintenance to resolve the issue.