Always use a diagnostic tool (such as Lexia/PP2000 or Diagbox) specifically designed for Peugeot/Citroën to get the exact fault description before replacing parts.
The “C” in 098C stood for “Compétition Client” – a customer racing car for privateers. peugeot 098c
If your Peugeot is throwing this code, start with the basics: Always use a diagnostic tool (such as Lexia/PP2000