# 2002 Mercedes-Benz C-Class - Smokes

**URL:** <https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420>\
**Category:** Maintenance/Repairs\
**Tags:** mercedes-benz\
**Created:** [July 15, 2019, 1:01pm UTC](https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420 "2019-07-15T13:01:41Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![FaithBegede](https://avatars.discourse-cdn.com/v4/letter/f/76d3ee/32.png) [@FaithBegede](https://community.cartalk.com/u/FaithBegede)\
**Post date:** [July 15, 2019, 1:01pm UTC](https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420/1 "2019-07-15T13:01:42Z")

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My c240 is exhuming white smoke which is smelling like gadand one of the catalytic converter is not working.also its consuming a lot of petrol.what could be happening.should i be worried

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**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\
**Post date:** [July 15, 2019, 1:08pm UTC](https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420/2 "2019-07-15T13:08:39Z")

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> [@FaithBegede](#):
>
> .what could be happening.should i be worried

Guessing - head gasket failure - worried yes - mechanic needed - smelling like gadand ???

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**Author:** ![FaithBegede](https://avatars.discourse-cdn.com/v4/letter/f/76d3ee/32.png) [@FaithBegede](https://community.cartalk.com/u/FaithBegede)\
**Post date:** [July 15, 2019, 1:13pm UTC](https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420/3 "2019-07-15T13:13:06Z")

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The white smoke smells like gas/petrol

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**Author:** ![shadowfax](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/shadowfax/32/13026_2.png) [@shadowfax](https://community.cartalk.com/u/shadowfax)\
**Post date:** [July 15, 2019, 2:32pm UTC](https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420/4 "2019-07-15T14:32:50Z")

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I’m guessing the gas smell points to why one of your catalytic converters failed. White smoke indicates coolant getting into the exhaust.

If I had to guess, one of the cylinders isn’t firing properly, which is dumping raw fuel into the exhaust where it is wrecking the catalytic converter. That’s also why you’re consuming a lot of gas - you’re wasting a bunch of it in the cylinder that isn’t firing.

So yeah, I unfortunately concur with @VOLVO_V70 - you should be worried because this is probably going to be expensive.

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<div class="post-metadata">

**Author:** ![FaithBegede](https://avatars.discourse-cdn.com/v4/letter/f/76d3ee/32.png) [@FaithBegede](https://community.cartalk.com/u/FaithBegede)\
**Post date:** [July 15, 2019, 2:48pm UTC](https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420/5 "2019-07-15T14:48:24Z")

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Another problem that a mechanic just found is that one of the coil packs is not firing properly

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**Author:** ![lion9car](https://avatars.discourse-cdn.com/v4/letter/l/59ef9b/32.png) [@lion9car](https://community.cartalk.com/u/lion9car)\
**Post date:** [July 15, 2019, 2:53pm UTC](https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420/6 "2019-07-15T14:53:47Z")

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To be clear, you want to be sure the engine problem is fixed before you replace the converter. Otherwise you might kill the new one.

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**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\
**Post date:** [July 15, 2019, 3:05pm UTC](https://community.cartalk.com/t/2002-mercedes-benz-c-class-smokes/144420/7 "2019-07-15T15:05:42Z")

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exhume=dig out. thats an interesting way to say your car is emitting/exhausting white smoke