Oxygen Sensor — Audi Q7
Category: Engine | Severity: medium | Cost: ₹3,000–₹15,000
What is Oxygen Sensor?
The oxygen sensor measures oxygen levels in exhaust gases to optimize fuel-air mixture.
How Oxygen Sensor Works
It sends real-time data to ECU, helping maintain efficient combustion and emissions control.
Why is Oxygen Sensor Important?
Improves fuel efficiency and reduces emissions.
Common Problems
- Sensor failure
- Slow response
- Contamination
Symptoms
- Poor mileage
- Check engine light
- Rough idling
Causes of Failure
- Carbon buildup
- Aging
- Fuel contamination
Impact on Car Performance
Faulty sensor reduces efficiency and increases emissions.
DIY Fix Guide — Step by Step
- Scan error codes
- Inspect wiring
- Clean sensor if possible
- Replace if faulty
- Reset ECU
Maintenance Tips
- Use quality fuel
- Regular servicing
Replacement Cost in India
Estimated range: ₹3,000 – ₹15,000
Where to Buy Online
When to Replace Oxygen Sensor
Replace every 80,000–1,00,000 km or when faulty.