Done a couple of 2003 Pug 206's in the past both with the 1.4 petrol engine.
I would also recommend a new serpentine belt & the idler pulley wheels as the bearings will be likely worn.
The spring loaded tensioner pulley wheel can be removed & swopped - IIRC this bolt holding the pulley wheel has a left hand thread.
IIRC you can use a 4mm allen key inserted in to the hole on the tensioner assembly to hold it in the released position.
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