SCR Catalyst — Renault Duster
Category: Exhaust | Severity: high | Cost: ₹30,000–₹90,000
What is SCR Catalyst?
Selective Catalytic Reduction unit reduces NOx emissions using DEF fluid.
How SCR Catalyst Works
Injects AdBlue into exhaust gases which reacts in catalyst to convert NOx into nitrogen and water.
Why is SCR Catalyst Important?
Essential for meeting BS6 diesel emission standards.
Common Problems
- Clogging
- Reduced efficiency
Symptoms
- Warning light
- High emissions
Causes of Failure
- Poor DEF quality
- Sensor malfunction
Impact on Car Performance
Failure increases NOx emissions and can limit engine performance.
DIY Fix Guide — Step by Step
- Refill DEF
- Check injector
- Scan ECU for errors
Maintenance Tips
- Use genuine AdBlue
- Check DEF level regularly
Replacement Cost in India
Estimated range: ₹30,000 – ₹90,000
Where to Buy Online
When to Replace SCR Catalyst
When emissions exceed limits or catalyst efficiency drops.