A bad oxygen sensor can cause several issues in your vehicle’s performance, as it’s responsible for monitoring the air-fuel mixture in the engine. Here’s how to identify a failing oxygen sensor and some common Diagnostic Trouble Codes (DTC) that might point to the problem. Signs of a Bad Oxygen Sensor: 1. Check Engine Light: The most common indicator of an oxygen sensor issue. 2. Poor Fuel Economy: A bad sensor can disrupt the fuel-air ratio, leading to reduced gas mileage. 3. Engine Performance Issues: Hesitation, rough idling, stalling, or a general loss of power can be symptoms. 4. Exhaust Smoke: Excessive black or white smoke may result from an incorrect air-fuel mix. Common DTC Codes for Oxygen Sensors: 1. P0130: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 1) 2. P0131: Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) 3. P0132: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 1) 4. P0133: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1) 5. P0134: Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1) 6. P0135: Oxygen Sensor Heater Circuit Open (Bank 1 Sensor 1) 7. P0136: Oxygen Sensor Heater Control Circuit Open (Bank 1 Sensor 1) 8. P0137: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1) #carcare #enginehealth #oxygensensor #dtccodes #carmaintenance #mechanictips Mechanics Reels