P204F on Dacia
Reductant System Incorrect Quantity
P204F on Dacia vehicles indicates reductant system incorrect quantity. Au7o has documented this code across 1 Dacia model — most commonly on Duster. 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. Typical repair costs on Dacia range from $300 to $1,500, depending on the specific model and root cause.
Common Causes of P204F
- •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
P204F 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 P204F across all makes →Frequently Asked Questions
What does P204F mean on 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 specifically, this code is documented across 1 model.
What causes P204F on Dacia vehicles?▼
Common causes on Dacia: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P204F 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 P204F documented?▼
Au7o has documented P204F on 1 Dacia model: Duster.