AdBlue Tank Revision C4 Picasso

Error Codes:
P20E8 - AdBlue pressure too low

The original PSA AdBlue tank with OE code 9818559480designed for the SCR system of PSA models. The unit integrates a plastic tank body, electric pump module, level and temperature sensors, anti-freeze heating elements, and quick connectors to the SCR dosing line. It manages the storage, conditioning, and delivery of the urea solution to the DeNOx catalyst.
DIPA performs revision and testing of the unit (pump, heaters, sensors, wiring harness, and seals) with dedicated functional tests.

Technical specifications

• HDPE tank resistant to urea, salinityà and thermal shocks, with dedicated mounting points to the chassis.
• 12 V integrated pump module with pressure sensor and non-return valve.
• Internal level and temperature sensors for managing dosing and cold strategies.
• Heating elements of the tank/line to prevent freezing and crystallization.
• Integrated suction filter and purge/return circuit to limit deposits.
• Sealed wiring with multipole connector for power supplies and signals.
• Quick connectors with O-rings specific for AdBlue and sealed cable entry.

DIPA può intervene to revise this component as wellì important for the proper functioning of the engine.

Functionalityà

• Storage and thermal conditioning of the urea solution 32,5%.
• Pressurization and supply of the SCR dosing unit according to ECU DeNOx/engine commands.
• Automatic purging of the line when the engine is off to reduce crystal formation.
• Continuous monitoring of level and temperature for cold start strategies and catalyst efficiency.
• Support for diagnostic procedures after refilling/replacement (filling registration, actuator tests, and purging).

Model applications

Citroën

• C4 Picasso
• C4 SpaceTourer

DIPA recommends to always check compatibilityà of the spare part before’purchase.

Typical defects

• Reduced urea circuit pressure due to pump wear, clogged filter or micro-leaks → SCR warning lights and performance limitations.
• Failure of tank/line heaters → freezing of the fluid and activation delays at low temperatures.
• Abnormal level/temperature sensors → incorrect indications “UREA” and degraded strategies.
• Crystallization in the tank/lines or blocked SCR injector → insufficient dosing and catalyst efficiency errors.
• Oxidation/leakage on cable glands or connectors → electrical interruptions/intermittencies.
• Mechanical damage to the shell (impacts, abrasions) → leakages and smell of ammonia.

Any associated DTC codes

• P20E8 – Insufficient reducing pressure/urea.

Final conclusions

The AdBlue tank PSA 9818559480 è is a key component of the SCR system in PSA models. In the presence of warning lights or codes related to pressure, heating, or sensors, the’correct intervention involves targeted diagnosis, purging/cleaning of the line, checking the’SCR injector and, if necessary, replacing the tank.

DIPA offers a wide range of spare parts: from original ones to aftermarket parts selected from the best manufacturers on the market. Not only that: it also has refurbished components with performance equal to new, which allows for savings in replacement and contributes to the protection of the’environment thanks to the’circular economy. If the spare part that suits you is not è available, don't worry: DIPA canò revise “on demand” your part, restoring its full functionalityà and safety in a short time.