(Car #1 - 2012 Impreza) In the past I've changed both front bearing/hub assemblies on one of my Subarus, and that went fine.
(Car #2 - 2011 Forester) Now I'm working on our other car - different model Subaru but its all exactly the same procedure & parts for the front hub as the first one I did.
So I swapped in the new hub/bearing without any mechanical issues. Then took the car for a 1 mile test drive and that was also fine (no dashboard lights). Thought I was done.
The next day we take #2 out and immediately all the dash lights come on when its started - ABS, traction control, check engine, a few others. But nothing sounds odd and I drove it about 100 feet, it operated fine.
Reading around the subject it sounded like this could be an incompatibility between the hub & the ABS sensor... and I did happen to use a different brand of hub on car #2 than I did on #1.
So today I replaced it with a new one using the known-good brand. But its exactly the same problem.
At this point I'm looking for advice on how to diagnose this. I guess there are at least two possibilities:
- ABS sensor is broken.
- Both hub assemblies are defective.
I would have thought #1 in the first place, except that it did work for that very first test drive. I thought this would have eliminated the sensor from being a possibility?
Is there any way to test the sensor itself? If I pull it out is it likely I would noticed a problem visually?
I've left the sensors in place when I've done these hubs and was very careful with them. I had read that sometimes trying to remove them can result in a broken bolt (here in the rust belt) and that seemed like it would be a much worse problem. But that might have left it subject to damage.
The hub assembly includes the ring that the sensor reads.