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- (O2) Oxygen Sensor: Function – Failure Symptoms – With Testing
- Oxygen Sensor (O2) – Rich Or Lean Engine Codes, What To Check
- (O2) Oxygen Sensors – Function, Failure Symptoms, And Testing
An (O2) sensor monitors the amount of oxygen in a vehicle’s exhaust gas to help the engine’s computer (ECU) maintain the ideal air-fuel ratio. It does this by detecting how much oxygen is left after combustion and sending a signal to the (ECU). Which then adjusts the fuel delivery to ensure proper, efficient, and clean burning.
What The (O2) Sensor Does:
Monitors exhaust:
The sensor is located in the exhaust pipe and continuously measures the unburned oxygen in the exhaust gases.
Generates a signal:
Based on the difference in oxygen levels between the exhaust and the outside air, the sensor generates a voltage. A higher voltage indicates a “rich” mixture (too much fuel, not enough oxygen). While a lower voltage signals a “lean” mixture (too much air, not enough fuel).
Adjusts air-fuel ratio:
The ECU receives this voltage signal and uses it to make real-time adjustments to the amount of fuel injected into the engine. The goal is to achieve the “stoichiometric” ratio. Which is the ideal air-to-fuel mix for efficient combustion.
Improves performance:
By keeping the air-fuel ratio balanced, (O2) sensors help improve fuel efficiency: reduce emissions, and protect the engine and catalytic converter from damage.
Triggering the check engine light:
A faulty (O2) sensor can trigger a (CEL), as it’s a crucial component for proper engine operation and emissions control.
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