How do I know if bmw n20 timing chain is bad?

A timing chain n20 doesn't need to be replaced unless there is a problem with it.

How much does n20 timing chain replacement?

When did BMW fix n20 timing chain?

Where can watch about bmw n20 timing chain replacement DIY?

How long does it take to change bmw n20 oil pump timing?

PARTS NUMBER: HJ-02226-SLD

Specification:
Fits 8-Speed 8HP45 8HP70 Automatic Transmission

Application:

• Replacement for 2011-ON   BMW 3 SERIES L4 2.0L L6 3.0L
• Replacement for 2009-2011 BMW 5 SERIES/GT L4 3.0L L6 2.5L L6 3.0L V8 4.4L
• Replacement for 2009-2011 BMW 7 SERIES L4 2.0L L6 3.0L V8 4.4L
• Replacement for 2010-2011 BMW X3 L6 3.0L
• Replacement for 2010-2011 BMW X5 L4 2.0L
• Replacement for 2010-2011 BMW X6 L4 2.0L

ATTENTION:
Highly suggest install by a professional repair shop.

Package Include:
9 x Transmission Solenoids