P20EE on Dacia
SCR NOx Catalyst Efficiency Below Threshold
P20EE on Dacia vehicles indicates scr nox catalyst efficiency below threshold. Au7o has documented this code across 1 Dacia model — most commonly on Duster. This is a diesel emissions code meaning the Selective Catalytic Reduction (SCR) catalyst on Bank 1 is not cleaning up exhaust as well as it should. The SCR system sprays Diesel Exhaust Fluid (DEF) into the hot exhaust to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water; NOx sensors before and after the catalyst tell the computer how well it is working. When the measured efficiency falls below the required threshold, this code sets. Because it is an emissions-protection code, it often triggers warning lights and can lead to reduced power or a speed limit (a 'derate') if left unfixed. Typical repair costs on Dacia range from $300 to $1,500, depending on the specific model and root cause.
Common Causes of P20EE
- •Poor quality, contaminated, or wrong DEF fluid
- •Faulty or clogged DEF injector/dosing valve
- •Failed upstream or downstream NOx sensor
- •Degraded or failed SCR catalyst
- •Exhaust gas temperature sensor fault affecting dosing
- •Exhaust or DEF line leak
- •DEF line/heater problems (crystallization or freezing)
P20EE 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 P20EE across all makes →Frequently Asked Questions
What does P20EE mean on Dacia?▼
P20EE stands for "SCR NOx Catalyst Efficiency Below Threshold." This is a diesel emissions code meaning the Selective Catalytic Reduction (SCR) catalyst on Bank 1 is not cleaning up exhaust as well as it should. The SCR system sprays Diesel Exhaust Fluid (DEF) into the hot exhaust to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water; NOx sensors before and after the catalyst tell the computer how well it is working. When the measured efficiency falls below the required threshold, this code sets. Because it is an emissions-protection code, it often triggers warning lights and can lead to reduced power or a speed limit (a 'derate') if left unfixed. On Dacia specifically, this code is documented across 1 model.
What causes P20EE on Dacia vehicles?▼
Common causes on Dacia: Poor quality, contaminated, or wrong DEF fluid, Faulty or clogged DEF injector/dosing valve, Failed upstream or downstream NOx sensor, Degraded or failed SCR catalyst, Exhaust gas temperature sensor fault affecting dosing. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P20EE 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 P20EE documented?▼
Au7o has documented P20EE on 1 Dacia model: Duster.