Quote:
Originally Posted by LM964
PDAS/Diff lock light and Brake Pressure warning light or PDAS/Diff light and ABS light? - two potentially different issues.
Also has the accumulator ('bomb') and diff lock solenoids ever been bled in the recent past? A 'hammer' diags plug in should throw up issue details.
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I believe it is PDAS/Diff and Brake pressure. I just ordered Adrian's book and found this excellent description he wrote on rennlist of possible causes:
https://rennlist.com/forums/964-forum/315766-problems-with-the-diff-lock-on-a-c4.html
Based on my lights/symptoms, I'm guessing it is related to brake fluid/pressure and may need to have the system flushed as a first thing to try...