P040D is a well known exhaust temperature sensor on passenger side. Usually causes no issues. Full write up on here on how to replace but if car is not showing any warnings then no need to worry.
I'd clear them all and then recheck in a weeks time. The P040D will always come back. I had my sensor replaced by a specialist when it was in having other stuff done. I thought I might aswell get it done. Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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