[willbeing]

Hi All,

I'm fairly new to working on cars, but have had some success with our 2011 X5 50i and am loving it! We're throwing some codes right now and the engine is running at reduced power. These are the codes:

P054D cold start b camshaft position timing over-retarded bank 2
P0025 b camshaft position - timing over-retarded bank 2
P05CF cold start b camshaft position timing performance bank 2

Any idea what these could mean or how to diagnose? I'm seeing online that it could be the camshaft sensor, crankshaft sensor, or solenoid valve. Are any of these more likely? Could it be anything else? Are these difficult repairs?

Thanks for your help,
Will