You might try getting the sensors recalibrated before replacing them. I had a similar issue where a light bump set off warnings, but a recalibration fixed it for way less money. It's worth asking your mechanic about it next time you're in.

Seeing that 1% fee eat your gains is like watching a snail steal your lunch... painfully slow but somehow effective. Those expense ratios are masters of disguise. Good thing you switched before it became a full-time job.