Question about 1994 Mercedes-Benz C-Class

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My c220 failed smog because of high hydrocarbons at 25 mph

At 15 mph it was fine and everything else passed

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  • zmoons2184 May 20, 2009

    the co2 was 14.6 for both 15 and 25,the hc was 48 at 15 and 70(thats what failed) at 25,co was 0.12 at 15 and 0.05 at 25,nox was at 285 at 15 and 15 at 25

  • Keith Heavilin
    Keith Heavilin May 11, 2010

    how many miles

  • DFARLEY May 11, 2010

    i need to know all of the readings for hc co nox at both speeds also co2

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Hc's are unburned fuel- I would change my sparkplugs and resmog it if that is the only gas that was high

Posted on Jun 01, 2009

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1 Answer

Smog failure High HC's only issue


Hydrocarbons (HCs) are unburned fuel. You may need to replace sparkplugs and wires, if this has been done or doesn't fix the problem you catalytic converter may be worn out.

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wow, no context but i can read your mind?
ok SMOG failed. right?
what speed, there are 2 in uSA, 15 and 25.mph.
so there are 3 tests, which one. all are PPM in usa.
parts per million.
but is that HC , CO, or NOX? or ?

based on your numbers is HC
hydrocarbons or in barstool, its raw gasoline leaving rear of car.
unburned fuel..

572 ppm is way too high 12-19 is normal
id say the CAT is bad.
but can be , engine is bad, and burned out the cat.
that is why all savvy mechanics, check the that the engines
holds closed loop status, (EFI closed loop) at the speed yours failed.
if not in closed loop the cat will burn up (rich)
that is first.
Once that is cured. you check HC again. if out of spec
you did burn up the can , new cat time.

that is the correct way.

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