Oxygen Sensor (O2 Sensor) — Audi Q3 Sportback

Category: Engine | Severity: medium | Cost: ₹3,000–₹15,000

What is Oxygen Sensor (O2 Sensor)?

Measures oxygen level in exhaust gases.

How Oxygen Sensor (O2 Sensor) Works

Sends data to ECU for air-fuel mixture adjustment.

Why is Oxygen Sensor (O2 Sensor) Important?

Maintains optimal combustion and emissions.

Common Problems

Sensor failure
Contamination

Symptoms

Check engine light
Poor mileage

Causes of Failure

Carbon buildup
Wear

Impact on Car Performance

Incorrect mixture reduces efficiency.

DIY Fix Guide — Step by Step

Scan ECU codes
Inspect sensor wiring
Clean or replace sensor
Reset ECU
Test performance

Maintenance Tips

Use clean fuel

Replacement Cost in India

Estimated range: ₹3,000 – ₹15,000

Where to Buy Online

When to Replace Oxygen Sensor (O2 Sensor)

Replace when faulty readings occur.