There are many sensors that can trip the check engine light to come on.
The "Check engine" light will illuminate and a code will set.
Check throttle positioning sensor.
The check engine light is triggered by the Engine Control Module (ECM). The ECM receives information from many sensors and determines when to illuminate the check engine light.
Check your owner's Manual located in the glove box. Usually means the engine needs a routine check of fluids or just an oil change.
Your local Chevrolet dealer or auto parts store can sell you a remanufactured engine or you can check your local salvage yard for a used engine.
There are 2 knock sensor on the 5.3L engine. And they are under the intake manifold. To get to them you will have to remove the whole top of the engine- INTAKE MANIFOLD. Why do you think they need replaced???? check engine light came on for 2 sensor
Either try disconnecting the battery for about 10 mins. or have vehicle scanned to determine the problem and have codes cleared
EVAP Emission control system leak (small). It could be as simple as a loose fuel cap.
How do you reset check engine light for the 2009 Chevy trail blazer?
Among many other possiblities, yes.
Check the owner's manual.
YES, It sure can if that is the problem. FIRST you need to have the engine scanned with a OBDII engine scanner to see what CODES the computer has stored.