GarageNation is Hyderabad's dedicated specialist for NOx Sensor Replacement — part of our DPF Cleaning & Repair division. We diagnose and repair this specific sub-system for all 35+ car brands with dealer-grade diagnostic tools, OEM-quality parts, and mechanics trained specifically on dpf cleaning systems. Cost range: ₹8,000 – ₹30,000. Turnaround: 1–2 hours. Warranty: 1 year on sensor.
NOx Sensor Replacement refers to upstream and downstream NOx sensor replacement for SCR system efficiency monitoring. GarageNation handles this specific repair daily — it is one of the most frequently misdiagnosed issues in Hyderabad workshops that lack OEM-level scan tool access and component-level expertise.
Based on GarageNation's Hyderabad workshop experience, NOx Sensor Replacement issues are most frequently seen on: BMW, Mercedes, Volkswagen, Ford. However, we perform this repair on all car brands sold in India.
NOx Sensor Replacement repair at GarageNation: ₹8,000 – ₹30,000. Turnaround time: 1–2 hours. Warranty: 1 year on sensor. We provide a written repair estimate before any work begins — no surprise charges.
What does the NOx sensor do in a diesel car?
BS6 diesel cars use two NOx sensors — one before the SCR catalyst and one after. The 'before' sensor tells the ECU how much AdBlue to inject for optimal NOx reduction. The 'after' sensor confirms that the SCR catalyst is reducing NOx to acceptable levels. If the 'after' sensor shows NOx still high, the ECU triggers a fault and eventually prevents engine start to avoid continued illegal emission.
Can I drive with a NOx sensor fault code?
Initially yes, but the ECU counts driven kilometres with the fault active. After a threshold (model-specific, typically 800–1,000 km), the car enters limp mode. After a further distance, the car will not start. GarageNation stocks NOx sensors for BMW N47/B47, VW 2.0 TDI, and Mercedes OM651 diesel — most common replacements in Hyderabad.
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