Knock Sensor — Audi Q3
Category: Engine | Severity: high | Cost: ₹3,000–₹12,000
What is Knock Sensor?
Knock sensor detects abnormal combustion (knocking).
How Knock Sensor Works
Sends vibration signals to ECU to adjust timing.
Why is Knock Sensor Important?
Prevents engine damage due to knocking.
Common Problems
- Failure
- Incorrect readings
Symptoms
- Engine knocking
- Power loss
Causes of Failure
- Wear
- Electrical faults
Impact on Car Performance
Leads to engine damage risk.
DIY Fix Guide — Step by Step
- Scan ECU
- Replace faulty sensor
Maintenance Tips
- Use correct fuel grade
Replacement Cost in India
Estimated range: ₹3,000 – ₹12,000
Where to Buy Online
When to Replace Knock Sensor
Replace when knocking detection fails.