TOYOTA CAMRY OBD1 CODES CODE 31

Last Summer I Replacesed The Head Gaskets On My 90 Camry. It Was A Pretty Big Job And I'll Admit I Made A Few Mistakes. I Also Learned A...

I Managed To Figure Out How To Get The Codes Off The Computer. My Question? These Are The 3 Codes I'm Getting 14, 24, And 31 What Do These...