I got a CEL and noticed some dry white stuff on the firewall. My first thought was a coolant leak, but I had gone through some extremely light-colored mud earlier and the lines seemed to point to the tires. So, I mentioned this to the AZ guy, and he said, “Coolant isn’t white, though.”

He also told me I NEEDED to get a new knock sensor, when I actually just had to remove and readjust my gas cap.