Please anyone can shed a light on this for me.
Also knock sensor where is it on this engine?
I will post images of my engine if someone can pin point the knock sensor.
thank you all

 

Knock Sensor location


Knock assembly part number for your VIN




DTC P2441 Info attached (This specific info is relative to the WRXSTI version but should give you some idea of the problem).

Air valves labeled on this diagram

 

Thank you guys I will look at this as I have no power in all gears and plus theres a tapping noise this showed up on the ECU as knock sensor.

 

Part 14845 and 14864 I've located them parts on my subaru. Any idea why they are there as my older impreza didn't have them.
my old car was wrx sti 1994 a Japanese import only 100 of them made never had this stuff on it!

 

Secondary air system introduced on later models to reach emission targets
Google AI answer
"A secondary air system (or secondary air injection) is an emissions control device that injects fresh, oxygen-rich air into the exhaust manifold downstream of the engine's exhaust valves during cold starts. This process, active for 20-90 seconds, facilitates "afterburning" of unburned hydrocarbons and carbon monoxide, while quickly heating the catalytic converter to operating temperature. "