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Q: Reduced engine power

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My car engine performance is reduced what could be the cause

My car has 154016 miles.
My car has an automatic transmission.

Hello there, many common problems will cause your 2009 Buick Terraza to have a loss of engine power. The most common would be spark plugs, fuel pump, coil, fuel injectors, MAF sensor, vacuum leak, oxygen sensors, or a wiring harness fault. A qualified Technician such as one from YourMechanic will be able to diagnose your loss of power and make any repairs required for your vehicle to run normally again.

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