Ask for and share advice on using the PicoScope kit to fix vehicles here.
I find the best way to see these small signals is by making a simple coil wrap with copper wire. Wrap copper wire 100x, solder a couple of terminals on ends and plug in to wiring to sensor. Then use 60A clamp around your 100x coil to read your signal which is now magnified 100x to make much easier to read.
Just what i have done and it works well.