I bought a cheap obd2 reader off Amazon and I inserted it into my 08 Tundra and put the key into the notch just before ignition, and it read my codes just fine. I have a power steering sensor failure which is common in the original sensor in cold weather. It's been on for years. It all seems to be communicating fine but then I go to erase codes and it says erase failure. Am I doin something wrong?