P204F on Dacia: How to Diagnose & Fix
Reductant System Incorrect Quantity
1 Dacia model · 1 documented issue · 1 critical · $300-$1,500 repair
P204F 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
- 1000 mile countdown
- EML
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…
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P204F 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 P204F mean on a Dacia?
P204F stands for "Reductant System Incorrect Quantity." This code is set on diesel SCR-equipped vehicles when the reductant (diesel exhaust fluid / DEF) system delivers an incorrect quantity of DEF, meaning the actual dosing or pressure doesn't match what the computer commanded. The reductant system pumps and injects DEF into the exhaust so the SCR catalyst can break down NOx emissions, and the computer monitors pressure and dosing performance. When it sees too much or too little fluid being delivered, or pressure that's out of range, it flags this performance code. Typical roots are a clogged or failing DEF pump, contaminated fluid, a faulty pressure sensor, or a bad injector. On Dacia it is documented across 1 model: Duster.
What are the most common causes of P204F?
The most common causes of P204F are: Contaminated or poor-quality diesel exhaust fluid (DEF), Faulty reductant (DEF) pressure sensor, Clogged DEF pump filter or weak/failing DEF pump, Faulty or clogged reductant injector, Leaking, cracked, or loose DEF lines/clamps, Crystallized DEF buildup blocking the system, Failed reductant/SCR control module, Wiring or connector faults in the reductant system. The specific cause varies by vehicle.
How much does it cost to fix P204F 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 P204F on a different make?
View P204F across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.