Re-build your diesel. Put on a custom chip and that will make up for engine power loss.
What would help would be an articulate question. Does "lose power" mean a loss of voltage/current, or a loss of engine power (horsepower/torque)?
What does reduce engine power means?
It is just like a check engine light. It comes on when the computer detects a malfunction.
Yes
You need to have someone pull the codes to further diagnos www.lextechautomotivellc.com
Oil leakage and loss of compression and power loss.
My idle was running rough and slight loss of power (5 cylinder engine). The power loss is more noticeable on cars with less cylinders.
clogged cat
Yes, fouled spark plugs can cause engine shaking, and loss or power. I'm not sure about knocking but I'd guess that too.
Probably the increased load on the engine caused by the power steering pump.
its the engine management light or the service light