NOx Sensor — Renault Duster
Category: Exhaust | Severity: high | Cost: ₹15,000–₹40,000
What is NOx Sensor?
Measures nitrogen oxide levels in exhaust gases for emission control.
How NOx Sensor Works
Detects NOx concentration and sends data to ECU for SCR optimization.
Why is NOx Sensor Important?
Critical for BS6 emission compliance in diesel engines.
Common Problems
- Sensor failure
- Incorrect readings
Symptoms
- Warning light
- Emission failure
Causes of Failure
- Contamination
- Electrical faults
Impact on Car Performance
Leads to high emissions and possible limp mode.
DIY Fix Guide — Step by Step
- Scan error codes
- Inspect sensor wiring
- Replace faulty unit
Maintenance Tips
- Use proper DEF
- Avoid contamination
Replacement Cost in India
Estimated range: ₹15,000 – ₹40,000
Where to Buy Online
When to Replace NOx Sensor
When sensor fails or gives incorrect readings.