I will often determine the oil leak by inspection. The fix is to replace the shaft oil seals, which involves taking the sprockets off the VVT hubs. It's probably worthwhile to do the timing belt at the same time, since it will have to come off anyway. Because you need to disassemble the VVT hub, it ...

The gear should only fit on the crankshaft one way. There are splines inside the gear, and corresponding splines on the crankshaft, and the gear will only fit on in one orientation and fully seat to the bottom. Other orientations it may go on only part way, but only one where it will seat all the wa...

At least you have been able to narrow it down to related to wheel speed! It may be that the lug nuts were not tight, or there was something hitting, that was dislodged when you removed/replace the wheels, so it's plausible that you may have fixed it. If it comes back, maybe rotate tires around? See ...

I vote 100% change the fluid, you'll be happy that you did. Transmission fluids can be a touchy subject and if you use the wrong spec you'll not be very happy. The AW5x transmission uses straight up JWS3309, folks can say what they wish about alternatives but for many years the most common fluids t...

It matters - that's how the ECU knows which rotation the crankshaft is on. I haven't worked on that exact year, but I think you'll find if you look closely, it will only go back properly in one orientation. Looking at the back of the camshaft, there is a groove that is offset from center. I think th...

You probably don't want to hear this, but I am wondering if it's the timing cover. The timing cover has the same type of seals as the valve covers, and over time they get hard and brittle too, and stop sealing so well. When I did mine, I did them all. (I had to take off the timing cover anyway, so i...

Very interesting. More interesting to note the incomplete drain hole. That would seem to be a problem... Thanks for sharing!

Roger

Explore around a little. If you go into each one, it will tell you when it occurred, how frequently it occurred, and how many normal cycles since it occurred. If it hasn't been read and cleared in a while, these may be old. (Perhaps when the battery went flat 2 years ago, or whatever happened to you...

If you are in a position to remove one of the wheels, you can often read the part number from the current rotor. Sometimes it's obscured by rust, depending upon where you live and drive. That can also take a bit of detective work if it's not a Volvo rotor, as you have to figure out who the manufactu...

Also, when the fan is not running, if I turn the manual knob, I see the green light for the A/C turn amber when the fan knob is at zero, then green when the fan is supposed to be turning. I have not been successful in inducing airflow by driving with the windows cracked open, so I don't even get any...