I never found an 'O' ring as you described when dismantling mine, but I'm like the 4th owner. However, mine is running well now but the CEL has popped on again. I'm gonna have the code diagnosed again. If it is O2 sensor related again, I'm gonna pull them and soak them overnight in gas, dry them out and reinstall. If there was an O ring involved in mine when new, it's not in the game anymore.
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