Easy to test - then easy to replace once you get the door panel off.
When door check straps start to fail you will find the door may not fully open, it may jam or possibly make grinding and scraping noises. If totally broken the door will not stay in the open position on its own.
Problem & Solution
Common among these chassis:
W116
Watch Kent's free YouTube video to learn how to test your check strap for proper operation. We carry good used check straps on our website as well as an on demand video manual on how to remove the door panels. That will be the most difficult part of the whole job.