Need locating the low fuel pressure sensor ON A 2016 XC90 after PO018C cod. Technically found there two sensors on fuel line , one like a TEE , quick connect and one in back of the engine in center on the fuel line, but Volvo dealer Toronto states that is under the car. Any help , picture or PN ,is useful.

 

I know this is an old post, but hopefully someone will find it useful if they have the same codes:
P018C seems to align with the low pressure (PN 31405791) and there has been an update to the older style Cooper to Sensata (PN 31432653).
P018D seems to align with the high pressure (on the fuel rail) and the PN is 31303497