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I have a 2011 c300 and I had the p0171 and p0174 code, I replaced the o2 sensors and when I was doing that I notice that it was a oil leak in the oil separator crank case and replace that one too, apparently the problem was solved and the engine light was off for about 4 days and came back on with codes p0171, p0174 and p0300, I replaced all spark plugs and coils, clean the maf and add an injector treatment to the gas, now the car takes longer to warm up, heater does not warm up enough and rpms are acting weird, any comments that can help me to understand what can be causing this?
A diagnostic tool reading Benz specific codes and live data monitoring are musts. The parts cannon road is a dangerous road, or at the very least, an expensive and confusing road.
Rich and/or lean conditions are caused by a number of circumstances and a number of components. With any system, there is a sequence and a ripple affect from one component to another. Knowing the components in each system that are giving you issues are a must, as well as each components role in said system. Don't just trust that because a code says there's a problem with "component A" that "component A" is actually the problem. "Component A" can give bad data because "Components B & C" aren't playing nice.
What type of injector cleaner did you run? Did you use specified MAF cleaner? At the very least, is the air filter box seated properly and are all seals from air box to MAF, and MAF down to throttle body good? (2 seals on the MAF elbow). I bring this up because everything we touch regardless of good intentions is a potential new problem if something goes astray upon reinstall. That something can be a lot of things....sometimes it's as simple as a new "bad" part.
Checked for vacuum leaks? You know the history of your car best. There is a lot to go through with issues like this. Running rich or lean is one thing, but your secondary list of issues is another. Especially if they didn't exist beforehand. Benz codes, live data, and review your work to start.
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