okey dokey.

I check my tires twice a week but I checked them again and they're fine. Is the TOD system connected through the normal obdII port? So if I take it to auto zone can they get an error code for me? Are there certain sensors that generally fail before others? The Vehicle speed sensor is probably working cause the speedo still works and the car shifts smoothly.

If it is a speed sensor how much do those usually cost to replace. I can see them on the bottom of the car so I gotta assume its not to labor intensive to fix one. How do you tell if they're bad.

Thanks guys!