I recently pulled some new codes from my car (P0051). There were 2 entries. Several months ago I pulled a pair of different codes (I can't recall the number but it was the one suggesting replacing an ignition coil). Both times I have reset them and the problem did not seem to re-occur. Is it safe to assume that there was some kind of hiccup? I'm assuming that unless an error code repeats that its not likely a real problem. Thanks in advance.