Need some help CEL is on... - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 12-18-2009, 10:29 AM Thread Starter
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Need some help CEL is on...

I have several issues with my car. I drive a 2005 C230 Kompressor and it just rolled over 100,000 miles. It is having problems shifting going up hills, poor acceleration, and the gas mileage has went down the tube. The CEL has came on. The codes that it give is P0301, P0303, and P0410. The first two codes are misfires and the third is for a secondary air system malfunction. I have replaced the spark plugs and the ignition coils. It is continuing to misfires and my fuel economy and lack of power in acceleration have not improved at all. A friend told me it also could be a vacuum hose coming off the supercharger that is under the air filter that could be causing the problems. Have any of y'all experienced this problem as well? Do you think it could be a problem with the fuel filter too? Any suggestions would be greatly appreciated.
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post #2 of 2 (permalink) Old 12-18-2009, 03:23 PM
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If your fuel filter is the original you are past due to replace it; those can cause poor acceleration. A bad O2 sensor will also cause a CEL but I think those throw a code. What about your MAF (mass airflow sensor)? That about due to go out too. Plug wires maybe? Look at the vacuum hoses. Try posting on the W203 forum, found in the sedans section, for info too. Welcome to the forum.

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