The faucet-like warning light is the check engine light. You may have more than one problem going on. When the P0171-4 codes appear, it means the car's computer is unable to make proper adjustments to control the air-fuel mixture, thus the car almost stopped. Too much fuel is going through the engine. The PCV valve is different than the valve cover. The PCV valve most likely connects to the valve cover on the engine. The cover is on top of the engine and serves as a "lid" for the engine valves. In most engines, the engine oil fill cap is located on a valve cover.