I’ve had a sulfur smell (exhaust) inside my car since I got rear-ended a few years back. I had the trunk checked for leaks in case the exhaust was getting sucked in that way, but all was tight. I hate to replace the catalytic converter, only to find that doesn’t fix the problem. I did have a new oxygen sensor put in, but that didn’t work. My check engine has been lit forever, but went off for a while when they replaced the oxygen sensor.
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