Knock Sensor for BMW XM — 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 signals to ECU to adjust ignition timing and prevent damage.
Why the Knock Sensor is Important
Protects engine from detonation damage.
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
- Wear
- Heat
Impact on Car Performance
Engine may run inefficiently or get damaged.
DIY Fix Guide — Step by Step
- Scan error codes
- Check wiring
Maintenance Tips
- Use quality fuel
Knock Sensor Replacement Cost in India
Expect to pay between ₹4,000 and ₹15,000 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 knocking detection fails.