97w140 coupe - Mercedes-Benz Forum
 
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post #1 of 2 Old 10-23-2019, 08:34 AM Thread Starter
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97w140 coupe

I keep getting a p0446 and after warm up also get p0300 and p0308. I have replaced the fume pump but still get these dtc’s. Where do I go from here?
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post #2 of 2 Old 10-23-2019, 01:08 PM
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The misfire codes and evap code are probably not related.

For the evap code it may need to be smoke tested or have the purge system inspected/tested.

For the misfire codes more often than not it is an ignition issue like the spark plugs or leads. What is the service history on those?
In rare cases an injector can fail causing the misfire.

What engine is in your W140?
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