C230 P0456 Code - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 06-08-2013, 03:41 PM Thread Starter
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C230 P0456 Code


I have a 2006 C230 kompressor sport with 140,000 miles. Have had the CEL come on several times over the last month. 2 weeks ago had multiple misfire codes come on, and my mechanic replaced all the spark plugs and coil packs. Several days later the engine idled rough for about 10 seconds and the CEL flashed. I stopped and turned the car off and started it back, CEL stayed on. Ran diagnostics again and misfire codes. Ran engine cleaner through the fuel tank, took it back to the mechanic and he said couldn't find any codes.

Last night CEL came back on, and now it's throwing a P0456 code. It's not rough idling anymore, but I did notice when I got on the Interstate and accelerated to about 75mph it accelerated rough.

Any thoughts?? Thanks! K
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post #2 of 4 (permalink) Old 06-09-2013, 08:06 AM
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P0456 is Evaporative Emmission System Leak detected. Check your gas cap. Make sure the gasket is good and the cap is on properly
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post #3 of 4 (permalink) Old 06-11-2013, 06:15 PM Thread Starter
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Yep, gas cap was the first thing i checked a few weeks ago, even bought a new MB factory cap and no change. Talked to the mechanic today. They have done the smoke test, pulled things apart, and are still finding no leak anywhere. Going to keep working on it tomorrow. Love the way the car drives but beginning to think to headache isn't worth it!
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post #4 of 4 (permalink) Old 03-24-2014, 10:25 AM
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any luck or updates on this. I am getting this code as well for 2006 c230.
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