How to fix Reduced engine power and check engine light on 2002 Trailblazer?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! That reduced engine power light on your Trailblazer is like a referee throwing a flag on the play. Hitting a hard bump could have triggered a loose or damaged connection, especially in the throttle body or sensor wiring. The reduced power mode and shaky acceleration are often related to throttle body issues, and the oil pressure drop could point to an engine misfire or low RPMs causing the system to go haywire. Try checking for any loose connections around the throttle body and sensors, or even the ignition coils, and if that doesn't clear it up, a scan for trouble codes will help pinpoint the exact issue. If you need any further advice or if you'd like help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!