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    Sensors That Trigger the Check Engine Light

    1 week ago

    Oxygen (O2) Sensor Monitors exhaust oxygen to optimize air-fuel ratio. Failure leads to rich/lean mixtures, poor mileage, and emissions issues. Common codes: P0130โ€“P0161 (circuit faults, slow response, heater issues). MAP Sensor (Manifold Absolute Pressure) Measures intake pressure to gauge engine load. Faults cause incorrect fuel injection and ignition timing. Common codes: P0105โ€“P0109 (range/performance/circuit problems). MAF Sensor (Mass Air Flow) Quantifies air entering the engine. Dirty or failed units result in hesitation and stalling. Common codes: P0100โ€“P0104 (signal low/high input faults). Throttle Position Sensor (TPS) Reports throttle opening to the ECU. Issues lead to poor acceleration and transmission shifts. Common codes: P0120โ€“P0124 (correlation/voltage errors). Coolant Temperature (ECT) Sensor Tracks engine temp for cold starts and fan operation. Bad readings cause hard starting and excess fuel use. Common codes: P0115โ€“P0119 (signal faults). Camshaft Position (CMP) Sensor Syncs fuel injection and ignition timing. Failure triggers misfires or no-start conditions. Common codes: P0340โ€“P0349 (circuit faults). Knock Sensor Detects detonation (knocking) to protect the engine. ECU retards timing, reducing power. Common codes: P0325โ€“P0334 (circuit/performance issues). Fuel Pressure Sensor Monitors rail pressure for efficient combustion. Faults disrupt fuel delivery. Common codes: P0087โ€“P0093 (pressure extremes/leaks). Pro Tip: Sensors may test fineโ€”check wiring, vacuum leaks, or ECU voltage first. Always scan live data, not just codes.Source: Dr. Mechanics Facebook
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