Read error codes without scanner on Pontiac G6

As this article points out, the ability to blink codes was available with older OBD-I vehicles. Once the OBD-II standard hit, the ability to "blink" out codes was lost. This changeover to ODB-II happened in 1996 for vehicles sold in the US.

I know the same is true for Volkswagen cars. Early models had the ability to blink out the codes when something was jumped, but modern cars needed a special reader.

This bit is conjecture on my part, but I think the reason is that OBD-II is much more complex so the simple blinking was just abandoned.

pontiac g6 is easy no tools needed or obd! turn key from off to on twice on second time leave in on position. car will ding the codes! like ding, d,d , d pause d,d,d,d,d,d,. thats four dings pause then 6.. code 46 anti theft system key no recongnizd. 44 is o2 censor ect..