It's not hard to remove them. A bit harder to put them in place at the correct angles, but still doable.

You have to remove needles.

90% of weird glitches in eco-friendly car electronics come from tin pest. https://en.wikipedia.org/wiki/Tin_pest

Search for "volvo dim repair" on ebay, or send to XeMoDex ($$$).

VIDA has CAN-bus query in its SQL database for the oil level sensor for P2. Some cars might have it.

We are in 2020 and we should be thankful that our old cars have a dipstick, so we can check the oil level every time the gas tank is filled, as instructed in owner's manual ;) What I can really complain about is a coolant temperature gauge that keeps sitting at center even when expansion tank is boi...

Remove the serpentine belt and check if the noise is gone.

Junk as in "consumer-grade handheld device has ergonomic and reliability issues when installed in a car". Garmin was way better, but it burned out in the middle of nowhere, with the smoke filling the cabin. I mistakenly named this model "nuvi 65LMT" as TomTom, because old TomToms (like GO730) where ...

This is what I have: https://a.d-cd.net/e6ccd2ds-960.jpg Head unit: Kenwood DDX6705s Navigation: Garmin nuvi 65LMT in original RTI module Display left to Kenwood: https://github.com/vtl/volvo-ddd https://youtu.be/IGYbGWCGaEE Under driver's seat: two Arduinos, one drives the display, works with CAN-b...

Yeah, saw that. My latency detection threshold is about 170 ns.

So it looks like the BUSY line in M32C is controlled from timer interrupt handler. The delay between last bit sent and BUSY lifted is 50 us with a very small jitter. The delay after ID sequence is fully sent is 500 us (well, 480 to 490 us). Going through all the permutations does not change anything...