Sounds like #10 in this link... in which case long reach tools and/or being a contortionist may help. Trying to remember if that is the one that goes into the side on the rear coolant accumulator/crosspipe... if it is then you will need to remove the microfilter bulkhead to gain more access to it against the firewall.

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X5 pics

RIP 4.6is.....

2003 4.6is