Is it safe to drive my car like this???

BooWFO said:

I won't suggest it if at all possible. Your front o2's are reading. Odds are that is the code.
Some believe you can damage an engine with an exhaust leak so close. ( pulling in cold air into hot combustion chamber)

Things to try to fix the problem.
1. replace the doghnut gasket on passenger side.
2. put some washers under the nut so they are what is pulling the pipe in. thereby hopefully allowing you to fully tighten pipe.

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