As above. If its clean and doesn't leak take it back for a free retest. If it isn't leaking he wont fail it. He wont know if you have replaced with a good second hand one. No need to panic 
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Volvo 850 TDI, 850 TDI, 850 TDI
Volvo V70 TDI, V70 TDI, Volvo V70 XC, (99)
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