"...Something else that hasn't changed is vendor's annoying, no, make that pathological mania for secrecy. Another gadget you can get is one to read and decipher the trouble codes emitted by your vehicle's engine. These have just a tiny bit of storage, so if you don't capture the information quickly it's lost, which makes diagnosing a transient problem ever so much fun. Auto manufacturers hate these and try to keep their codes as Big Important Sekkrits..."