P229F on Dacia
NOx Sensor Circuit Range/Performance (Bank 1 Sensor 2)
P229F on Dacia vehicles indicates nox sensor circuit range/performance (bank 1 sensor 2). Au7o has documented this code across 1 Dacia model — most commonly on Duster. 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. Typical repair costs on Dacia range from $300 to $1,500, depending on the specific model and root cause.
Common Causes of P229F
- •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
P229F on Dacia by Model
Dacia Duster(1 issue)
- Duster 1.5 Blue dCi AdBlue / SCR System Faults2018-2024
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.
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View P229F across all makes →Frequently Asked Questions
What does P229F mean on 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 specifically, this code is documented across 1 model.
What causes P229F on Dacia vehicles?▼
Common causes on Dacia: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P229F on a Dacia?▼
Repair costs on Dacia range from $300 to $1,500, depending on the specific model and root cause.
Which Dacia models have P229F documented?▼
Au7o has documented P229F on 1 Dacia model: Duster.