Q: Why do I have black soot on my exhaust? Check Engine is not on 2004 Mercedes E320

asked by on February 24, 2017

Why do I have black soothe on my exhaust? Check engine is not on
My car has an automatic transmission.

Hello - a bit of black soot on the exhaust pipe can be due to several things that don’t necessarily represent a problem. If you consistently drive short trips, where the engine doesn’t have a chance to warm up completely, or if this is a condition during winter weather when the engine intentionally runs with a richer fuel mixture, some black soot will accumulate on the tailpipe. Modern automotive electronics are really good at protecting the catalytic converters, so you should get a warning (via the Check Engine light) if there is any problem that threatens the converters. A good "freeway blast" work wonderfully to clean out any soot - Happy Motoring!

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