The O2 sensor measures the amount of air going into and coming out of your engine. If it doesn't work properly, your engine's spark + air + fuel ratios will read like they're incorrect and the check engine light will pop on. This is probably the cause if you also smell rotten eggs and there's black smoke coming out of your exhaust.. The check engine light warns a driver of a problem with the car's emissions system or trouble with a critical internal function. Address the issue as soon as possible. If the light comes on and.
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1. Check if you have enough oil in the engine ( see how to check the oil level ). Low coolant level can cause problems too. 2. Visually check if the battery terminals are tight and not too corroded (see the photo ). Loose battery terminals can cause the Check Engine light with 'low voltage' trouble codes. 3.. If a sensor is bad, causing the wrong reading, it will turn on the Check Engine Light. Sometimes, you can have a bad oxygen sensor and not notice any symptoms at all. Other times, it can cause decreased engine performance, depending on how much the air-fuel ratio is being adjusted. 4. Dirty Or Bad MAF Sensor.
