Had the same thing on my 2000 V40 when I first bought it. Ended up being the temp sensor malfunctioning.

Yeah, if you listen on decent enough speakers (not cell phone speaker) or headphones/earbuds it's easier to hear that rattling. It does seem to be coming from the area around the alternator/timing belt area. Was thinking it was the case rattling but, I wondered why it would only do it when it's cold...

Hey all! I've been dealing with this 2000 V40 for a few months now and it seems to be developing a new sound that I haven't heard before. I snapped a quick video that will illustrate what I mean much easier than I can describe: https://youtu.be/Ki85OCuoG84 As the video captions say; when the car has...

Hey all! Just had a code come up on Tuesday evening while I was coming home - P0420 Catalyst system below Efficiency Threshold (Bank1). I did some research and it seems to be the catalytic converter, specifically "Bank 1" being the front O2 sensor. The car runs just fine other than an occa...

Alschnertz, thanks for the reply! I'll look into those two things. I found a couple videos already on cleaning them. Do you have any suggestions in the case that neither of these things work? Meaning, aside from replacing these components, are there any others that may be contributing to this problem?

Hey all! I'll try to keep this to just the important info right off the bat and I apologize for redundancy if someone has already posted this in the past: :!: I've got a 2000 V40, bought from a friend of mine this past summer, and it's got a number of general problems (it wasn't taken the greatest ...