Crankshaft and camshaft sensors play vital roles in engine management by relaying information about the crankshaft's position and valve timing to the engine control unit (ECU). A malfunction in these sensors can lead to a range of issues, including misfires, poor acceleration, and stalling. Specifically, a failing camshaft sensor may result in rough idling, while a defective crankshaft sensor can cause hard starting and performance issues. The average lifespan of these sensors is between 100,000 to 150,000 miles, but factors such as heat, moisture, and physical damage can lead to premature failure. When issues arise, error codes P0335 and P0340 can help diagnose the problem. Replacement costs are relatively low, with camshaft sensors priced between $100 to $300 and crankshaft sensors from $40 to $150, plus labor fees that can range from $75 to $400. Regular maintenance and prompt attention to warning signs can prevent further engine damage.