To fix any code, you have to understand what it means & then diagnose all the systems & components that could affect that circuit. IMO, it helps to read SEVERAL versions of the code definitions, so do some searching for EEC-IV code lists. You can find a few at these links:
For 67, read this caption:
For 32, here's the EVP:
For 41, check for exhaust leaks by letting the engine idle & plugging the tailpipe with a damp rag. Leaks will become apparent as an obvious hiss/puff near the engine.