Oxygen Sensor — Audi A4

Category: Engine | Severity: medium | Cost: ₹5,000–₹20,000

What is Oxygen Sensor?

Oxygen sensor measures oxygen levels in exhaust gases.

How Oxygen Sensor Works

Sends data to ECU to adjust air-fuel mixture.

Why is Oxygen Sensor Important?

Ensures optimal combustion and emission control.

Common Problems

Sensor failure
Dirty sensor

Symptoms

Check engine light
Poor mileage

Causes of 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

Replacement Cost in India

Estimated range: ₹5,000 – ₹20,000

Where to Buy Online

When to Replace Oxygen Sensor

Replace if sensor fails or gives wrong readings.