When you buy a car from a manufacturer, you believe the car is legal and acording the homologation.
Otherwise, when you buy a new car, you must completely dismantle the car and rebuild it to check every component to see if it is according the homologation. When a driver buy a part to a manufacturer, is implicit that the part is according the homologation.
Here FIA must investigate the Peugeot Sport's behaviour.
The only exception is if tha part was not bought from Peugeot or was changed by the team / driver.
It's stupid and impossible to expect that every team check every component sold by the manufacturer. Is obligatoin of the manufacturer assure that what is selling comply the regulations.
From what I understand the part was changed by the team when they had their cooling issues.
Ray
2007 Australian Rally Champion Driver Class P3
2011 Australian Rally Champion Codriver Privateers Cup and Premier League,
2014 Australian Targa Champion Codriver Late Classic
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That will all depend on the price. There are a few rich people who don't care, but the biggest group of drivers are constrained by budget. If they can give good deals, they could sell cars.
They are not there yet and nor they won't be in future.
WRC mainclass from 2027