OE Member A0001405339 Urea Injection Pump Engine Adblue Pump For Mercedes

OE Member A0001405339 Urea Injection Pump Engine Adblue Pump for Mercedes

Brand	Number
Mercedes	ZGS003
Mercedes	A0001405339
Mercedes	A0001405339
Mercedes	0001405339
Mercedes	0001405339
Cummins	A050N052_B
Cummins	A050N052B

 

 

RFQ

A.  What is a urea pump and how does it work?

Suction & Filtration

The pump draws Diesel Exhaust Fluid (DEF) from the tank.

A filter removes any contaminants to prevent clogging or damage.

Pressurization

The pump pressurizes the DEF to the required level (usually between 4-9 bar).

A pressure sensor ensures the correct amount is delivered.

Injection into the Exhaust System

The pressurized DEF is sent through heated hoses to an injector (dosing valve) in the exhaust.

The injector sprays a fine mist of DEF into the hot exhaust gases before the SCR catalyst.

Chemical Reaction in the SCR Catalyst

In the SCR catalyst, DEF breaks down into ammonia (NH₃) and carbon dioxide (CO₂).

The ammonia reacts with NOₓ in the exhaust gas, converting it into harmless nitrogen (N₂) and water vapor (H₂O).

Monitoring & Adjustment

The ECU (Engine Control Unit) continuously monitors the system and adjusts DEF injection based on engine load and emissions levels.

Why Is the Urea Pump Important?

Reduces Emissions: Lowers harmful NOₓ emissions to meet environmental regulations.

Ensures SCR Efficiency: Provides precise DEF delivery for optimal performance.

Prevents Engine Derate: A failing pump can trigger engine power reduction.

Common Issues with Urea Pumps

Clogging due to contaminated or poor-quality DEF.

Freezing in extremely cold temperatures (some pumps have heating elements).

Wear and Tear leading to pressure loss or electrical failures.

 

B. Would you like additional details on troubleshooting or maintenance?

Urea Pump Troubleshooting & Maintenance

Common Urea Pump Issues & Solutions

Clogging or Blockage

Cause: Contaminated or low-quality DEF, crystallization of urea deposits.

Symptoms: Reduced DEF flow, system warning lights, error codes.

Solution:

Use high-quality, certified ISO 22241 DEF.

Regularly clean or replace DEF filters.

Flush the system if crystallization occurs.

Freezing in Cold Temperatures

Cause: DEF freezes at -11°C (12°F).

Symptoms: DEF not flowing, system faults, warning lights.

Solution:

Ensure the urea pump has a built-in heating element.

Park in a warm area or use a heater-equipped DEF tank.

Wait for the system to warm up before driving in cold weather.

Pump Failure (Mechanical or Electrical)

Cause: Normal wear and tear, voltage issues, sensor malfunctions.

Symptoms: No DEF injection, engine derate mode, fault codes.

Solution:

Check electrical connections and wiring harness for damage.

Use an OBD (On-Board Diagnostics) scanner to read error codes.

If the pump is faulty, replace it with an OEM or high-quality aftermarket unit.

Low DEF Pressure

Cause: Leaks, weak pump, faulty pressure sensor.

Symptoms: DEF consumption too low, reduced efficiency, check engine light.

Solution:

Inspect DEF hoses and seals for leaks.

Test the pressure sensor and replace if necessary.

If the pump is weak, consider replacing it.

Incorrect DEF Concentration

Cause: DEF diluted with water or expired fluid.

Symptoms: Poor NOₓ reduction, system warnings.

Solution:

Always use fresh, high-quality DEF (32.5% urea, 67.5% deionized water).

Store DEF properly to avoid contamination.

 

C. Whatis tips for urea pump ?

Urea Pump Maintenance Tips

✅ Use High-Quality DEF – Always use DEF that meets ISO 22241 standards.
✅ Keep the DEF Tank Clean – Prevent contamination by sealing the cap tightly.
✅ Inspect the System Regularly – Check for leaks, cracks, and warning codes.
✅ Avoid Running on Empty – Letting the DEF tank run dry can damage the pump.
✅ Winter Preparation – Ensure the heating system works in cold climates.
✅ OBD Scanner Usage – Use an OBD-II scanner to monitor system performance.

 

 

D. How to replace a urea pump or a list of error codes related to the system?

Tools & Equipment Needed

New urea pump (OEM or high-quality aftermarket)

OBD-II scanner (to clear fault codes)

Wrenches and screwdrivers

DEF-compatible gloves (to avoid contamination)

Safety goggles

Drain pan (for excess DEF)

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Step 1: Safety Precautions

Park the vehicle on a level surface.

Turn off the engine and disconnect the battery.

Wear gloves and safety goggles to protect against DEF spills.

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Step 2: Locate the Urea Pump

The urea pump is usually mounted near the DEF tank.

It may be covered by a protective shield-remove it with a wrench.

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Step 3: Drain the DEF System

Place a drain pan under the DEF tank.

Disconnect the DEF hoses carefully to drain any remaining fluid.

Tip: If DEF has crystallized, flush the system with warm water.

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Step 4: Remove the Old Urea Pump

Unplug the electrical connectors attached to the pump.

Loosen and remove the mounting bolts securing the pump.

Gently pull out the pump, ensuring no DEF spills on electrical components.

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Step 5: Install the New Urea Pump

Align the new pump with the mounting bracket.

Secure it using the original bolts.

Reconnect the DEF hoses and electrical connectors.

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Step 6: Refill the DEF Tank

Use fresh, high-quality DEF to refill the tank.

Ensure the cap is tightly sealed to prevent contamination.

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Step 7: Clear Error Codes & Test the System

Use an OBD-II scanner to reset the system and clear fault codes.

Start the engine and let it run for a few minutes.

Check for leaks, warning lights, or error messages.

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Step 8: Test Drive & Final Check

Drive the vehicle for 10-15 minutes to ensure proper DEF flow.

Monitor for check engine lights or abnormal performance.

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Common Urea Pump Error Codes & Their Meanings

Error Code	Meaning	Possible Solution
P20E8	DEF pressure too low	Check for leaks, replace urea pump if needed
P204F	DEF system efficiency low	Inspect injector, clean crystallized deposits
P20B9	DEF pump control module failure	Reset ECU, check electrical connections
P207F	NOₓ reduction efficiency below threshold	Verify DEF quality, inspect SCR system
P2200	NOₓ sensor circuit malfunction	Replace NOₓ sensor if faulty

 

Final Tips for Urea Pump Replacement

✅ Always use fresh, ISO-certified DEF to prevent contamination.
✅ Keep electrical connections dry to avoid corrosion or short circuits.
✅ Use an OBD scanner to diagnose and clear fault codes properly.
✅ Inspect hoses and filters regularly to prevent future failures.

 

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