I don’t understand why the Knock sensor has flagged up on the computer because all I did was change the Exhaust Manifold. Once that was changed the engine management light came on
yea you can reach it from below with some arm flexing. Its the green-one in the middle of the block.
Do you have a Kpro? If so i would just disable the knocksensor. The knocksensor is prone to state "shadowknocks" - especially with upgraded mounts or so. It is designed to detect a bad batch of gas, nothing more. Every tuner disables it.