Oxygen Sensor (O2 Sensor) — Audi Q3
Category: Engine | Severity: medium | Cost: ₹5,000–₹20,000
What is Oxygen Sensor (O2 Sensor)?
Oxygen sensor measures oxygen levels in exhaust gases.
How Oxygen Sensor (O2 Sensor) Works
Sends data to ECU for air-fuel ratio adjustment.
Why is Oxygen Sensor (O2 Sensor) Important?
Ensures optimal combustion and emission control.
Common Problems
- Sensor failure
- Contamination
Symptoms
- Check engine light
- Poor mileage
Causes of Failure
- Carbon deposits
- Wear
Impact on Car Performance
Leads to incorrect fuel mixture.
DIY Fix Guide — Step by Step
- Scan ECU codes
- Replace faulty sensor
Maintenance Tips
- Use quality fuel
Replacement Cost in India
Estimated range: ₹5,000 – ₹20,000
Where to Buy Online
When to Replace Oxygen Sensor (O2 Sensor)
Replace when faulty or giving incorrect readings.