Quote:
Originally Posted by Dave key
I've tried searching for a definitive answer
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There is no definitive answer as that message can be triggered by many many possible causes.
A code read with Dice and Vida is the best starting point which will give a Volvo specific code, explanation of the code and suggestions as to the possible causes and fixes.
Cheaper elm327 engine code readers are also available but with much reduced levels of information.
Basically, whether cheap or less cheap, get the codes read.