Knock Sensor for BMW M2 — Price, Symptoms & Replacement Guide
Category: Engine | Failure Severity: Medium | Replacement Cost in India: ₹3,000–₹12,000
What is the Knock Sensor?
The knock sensor detects abnormal combustion or engine knocking.
How the Knock Sensor Works
It sends vibration signals to ECU to adjust ignition timing.
Why the Knock Sensor is Important
Prevents engine damage due to knocking.
Common Problems with the Knock Sensor
- Sensor failure
- False signals
Warning Symptoms of a Failing Knock Sensor
- Engine knocking
- Reduced power
Common Causes of Knock Sensor Failure
- Heat
- Electrical faults
Impact on Car Performance
Faulty sensor may lead to engine damage.
DIY Fix Guide — Step by Step
- Scan ECU codes
- Check wiring
Maintenance Tips
- Use high-quality fuel
Knock Sensor Replacement Cost in India
Expect to pay between ₹3,000 and ₹12,000 for genuine parts plus labour at an authorised BMW 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 when faulty or inaccurate.