I drive a '97 Honda Accord wagon, manual, that is reasonably well taken care of. Recently I've noticed a very high pitched squeak that happens intermittently. It's difficult to tell what in my driving causes it to happen, but it will always stop when the breaks are applied even slightly. It seems to be unrelated to RPM or speed. Around the time that this squeak appeared, my check engine light came on which turned out to be the catalytic converter. Any ideas? Thanks for your help.