Knock Sensor for Audi S5 Sportback — Price, Symptoms & Replacement Guide
Category: Engine | Failure Severity: Medium | Replacement Cost in India: ₹4,000–₹15,000
What is the Knock Sensor?
Detects abnormal combustion (knocking) in the engine.
How the Knock Sensor Works
Sends vibration data to ECU which adjusts timing.
Why the Knock Sensor is Important
Prevents engine damage due to detonation.
Common Problems with the Knock Sensor
- Sensor failure
Warning Symptoms of a Failing Knock Sensor
- Knocking noise
- Reduced power
Common Causes of Knock Sensor Failure
- Heat
- Wear
Impact on Car Performance
Engine runs inefficiently.
DIY Fix Guide — Step by Step
- Scan ECU
Maintenance Tips
- Use correct fuel grade
Knock Sensor Replacement Cost in India
Expect to pay between ₹4,000 and ₹15,000 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 Knock Sensor Online
Search trusted Indian car-parts retailers like Boodmo, Amazon India and Flipkart for genuine and OEM-grade Knock Sensor listings.
When to Replace the Knock Sensor
Replace if knocking persists.