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It's probably your battery vent hose--- (archive)
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Posted by MicahO on May 06, 2001 at 23:07:17:

In Reply to: Stink (smells like rotten eggs) comes from 94 525i posted by Kenric on May 06, 2001 at 22:03:23:

The battery, under your rear seat on the passenger side, has a vent tube to release any gases that have to be let off. It probably came detached from the battery, allowing the stinky, sulpher-hydrogen smelling gases to enter the passenger compartment. Lift the back seat and look for the vent hose.



Any ideas on what this is? I don't notice it on the road, but when after driving for a while (and usually after racing the engine for a tiny bit on the road) I pull into the garage, it stinks like rotten eggs. I'm guessing this is some sort of exhaust, but I don't think it's normal. Any guesses on what this is? 94 525i




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