Oxygen Sensor for Audi A4 — Price, Symptoms & Replacement Guide
Category: Engine | Failure Severity: Medium | Replacement Cost in India: ₹5,000–₹20,000
What is the Oxygen Sensor?
Oxygen sensor measures oxygen levels in exhaust gases.
How the Oxygen Sensor Works
Sends data to ECU to adjust air-fuel mixture.
Why the Oxygen Sensor is Important
Ensures optimal combustion and emission control.
Common Problems with the Oxygen Sensor
- Sensor failure
- Dirty sensor
Warning Symptoms of a Failing Oxygen Sensor
- Check engine light
- Poor mileage
Common Causes of Oxygen Sensor Failure
- Contamination
- Wear
Impact on Car Performance
Incorrect readings affect fuel efficiency.
DIY Fix Guide — Step by Step
- Scan ECU
- Inspect wiring
- Replace faulty sensor
Maintenance Tips
- Use quality fuel
Oxygen Sensor Replacement Cost in India
Expect to pay between ₹5,000 and ₹20,000 for genuine parts plus labour at an authorised Audi workshop. Local garages and aftermarket parts can be 20–40% cheaper but may compromise warranty.
Where to Buy Oxygen Sensor Online
Search trusted Indian car-parts retailers like Boodmo, Amazon India and Flipkart for genuine and OEM-grade Oxygen Sensor listings.
When to Replace the Oxygen Sensor
Replace if sensor fails or gives wrong readings.