P229F on Dacia: How to Diagnose & Fix
NOx Sensor Circuit Range/Performance (Bank 1 Sensor 2)
1 Dacia model · 1 documented issue · 1 critical · $300-$1,500 repair
P229F on Dacia by model: symptoms, diagnosis and fix
The 1.5 Blue dCi (post-2018 Euro 6d) in Duster, Sandero, Logan uses an SCR/AdBlue system that has been the subject of multiple TSBs across Renault-Nissan-Dacia. Common faults: AdBlue heater failure (cold-weather), NOx sensor failure, AdBlue injector clogging, eventually limp mode and 1,000-mile countdown warning.
Common Symptoms
- AdBlue warning
- Limp mode
- 1,000-mile countdown warning
- Engine management light
How to Fix
NOx sensor replacement €300-€500. AdBlue heater + injector module €350-€700. AdBlue tank replacement €600-€1,200. Always top up AdBlue at every service to avoid crystallization. Some markets covered by Renault extended warranty — check records.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- PEAK BlueDEF ISO 22241 diesel exhaust fluid, 2.5 gallons
top up the SCR tank with compliant DEF after checking level and contamination Fitment/availability: Dacia Duster 1.5 Blue dCi SCR tank only; fresh sealed product conforms to ISO 22241-1, verify required refill quantity and never pour int…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
P229F code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P229F mean on a Dacia?
P229F stands for "NOx Sensor Circuit Range/Performance (Bank 1 Sensor 2)." P229F indicates the engine control module detected a range/performance problem with the downstream NOx sensor on bank 1 (sensor 2), most common on diesel vehicles with SCR/AdBlue emissions systems. The NOx sensor measures nitrogen-oxide levels in the exhaust so the system can dose diesel exhaust fluid correctly and verify the catalyst is working. An implausible or out-of-range signal can trigger emissions warnings, reduced power, and on many diesels eventual no-start countdowns tied to emissions compliance. It is an emissions-system fault that should be addressed before it escalates. On Dacia it is documented across 1 model: Duster.
What are the most common causes of P229F?
The most common causes of P229F are: Faulty downstream NOx sensor (bank 1 sensor 2), Wiring or connector corrosion at the NOx sensor, Exhaust leak upstream of the sensor, Contaminated or incorrect diesel exhaust fluid (DEF/AdBlue), SCR catalyst degradation, NOx sensor control-module communication fault, ECM software needing update/recalibration. The specific cause varies by vehicle.
How much does it cost to fix P229F on a Dacia?
Published repair estimates on Dacia range from $300 to $1,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P229F on a different make?
View P229F across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.