Downstream O2 Sensor for Maruti Suzuki Swift — Price, Symptoms & Replacement Guide
Category: Exhaust | Failure Severity: Medium | Replacement Cost in India: ₹2,000–₹7,000
What is the Downstream O2 Sensor?
Located after catalytic converter to monitor emission efficiency.
How the Downstream O2 Sensor Works
Checks oxygen levels after catalytic conversion.
Why the Downstream O2 Sensor is Important
Ensures catalytic converter is functioning properly.
Common Problems with the Downstream O2 Sensor
- Sensor aging
- Incorrect readings
Warning Symptoms of a Failing Downstream O2 Sensor
- Check engine light
- Emission test failure
Common Causes of Downstream O2 Sensor Failure
- Wear and tear
- Heat exposure
Impact on Car Performance
Affects emission compliance.
DIY Fix Guide — Step by Step
- Scan ECU
- Replace sensor
Maintenance Tips
- Maintain exhaust system
- Check catalytic converter
Downstream O2 Sensor Replacement Cost in India
Expect to pay between ₹2,000 and ₹7,000 for genuine parts plus labour at an authorised Maruti Suzuki workshop. Local garages and aftermarket parts can be 20–40% cheaper but may compromise warranty.
Where to Buy Downstream O2 Sensor Online
Search trusted Indian car-parts retailers like Boodmo, Amazon India and Flipkart for genuine and OEM-grade Downstream O2 Sensor listings.
When to Replace the Downstream O2 Sensor
When emissions increase or sensor fails.