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🔧 What does the O2 sensor do? The oxygen sensor monitors the amount of oxygen in the exhaust gases. It sends this information to the engine control unit (ECU), which uses it to adjust the air-fuel mixture going into the engine. ⸻ ⚠️ When the O2 sensor is bad: • It sends wrong data or no data to the ECU. • The ECU can’t correctly balance the air-to-fuel ratio. • The car ends up running either: • Too rich (more fuel than needed) → wastes fuel • Too lean (less fuel) → poor performance and damage r

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