Does BG 2059003 replace OE A0004905300?

Yes. BG 2059003 is listed against A0004905300 and A3C0540140000. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 2059003 fit?

Recorded coverage includes Mercedes-Benz. It is supplied as a direct-fit aftermarket def dosing modules. Adaptation, reset or relearn procedures required by the vehicle manufacturer still apply after installation.

Does this fault code always mean the def dosing modules has failed?

No. Exhaust leaks, wiring and connector damage, reductant quality, dosing performance and upstream engine faults can all produce the same codes. Validate those inputs before replacing BG 2059003.

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2059003

Urea (AdBlue) Dosing Module for MERCEDES-BENZ C-CLASS / E-CLASS / GLC / SPRINTER – OE A0004905300

Urea (AdBlue) Dosing Module (OE A0004905300) for MERCEDES-BENZ C-CLASS / E-CLASS / GLC / SPRINTER SCR/AdBlue aftertreatment systems. Cross-referenced with 1 alternate OE number.

BG Part Number: 2059003
Category: DEF Dosing Modules
Application: MERCEDES-BENZ C-CLASS / E-CLASS / GLC / SPRINTER
Vehicle Manufacturer: MERCEDES-BENZ

Applications

OE Cross References

A0004905300
A3C0540140000

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Product Description

This urea (adblue) dosing module is designed as a direct-fit replacement for MERCEDES-BENZ C-CLASS / E-CLASS / GLC / SPRINTER. It meters precise doses of AdBlue / Diesel Exhaust Fluid (DEF) into the exhaust stream as part of the vehicle's Selective Catalytic Reduction (SCR) aftertreatment system, converting NOx emissions into harmless nitrogen and water vapor to help the engine meet its emission standard. Primary OE reference number: A0004905300. It also cross-references to OE/aftermarket numbers including A3C0540140000. Manufactured by BG Brand (Wenzhou Best Growth IE Co., Ltd.) to OE-equivalent fit, form and function, this part is tested for reliable sealing and dosing accuracy, offering workshops, parts distributors and vehicle owners a quality-assured alternative to OEM pricing for scheduled SCR system maintenance and repair.

Vehicle manufacturer names, logos and OE reference numbers are used for identification and compatibility purposes only. BEST GROWTH products are independent aftermarket products and are not manufactured, sponsored or endorsed by the respective vehicle manufacturers.

BG 2059003 (OE A0004905300): function on the vehicle

Urea (AdBlue) Dosing Module for MERCEDES-BENZ C-CLASS / E-CLASS / GLC / SPRINTER – OE A0004905300 is supplied by BEST GROWTH under part number 2059003, cross-referenced to OE A0004905300, as a direct-fit aftermarket def dosing modules. In service it meters DEF under pump pressure through a solenoid injector into the hot exhaust pipe, with a cooling circuit or heat shield keeping the injector body below its thermal limit between doses.

BG 2059003 is built to the position defined by its OE application in passenger car and light commercial vehicle service on the platform from Mercedes-Benz. Position, calibration and connector layout are part of the specification, so a part that physically fits is not automatically the correct part.

A dosing module rarely fails alone. Deposits are usually evidence of a temperature or mixing problem that will destroy the replacement unless it is corrected.

Fitment for Mercedes-Benz and OE cross reference

BG 2059003 replaces 2 OE references: A0004905300 and A3C0540140000. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 2059003 includes Mercedes-Benz, typically on MERCEDES-BENZ C-CLASS / E-CLASS / GLC / SPRINTER. Coverage lists are a starting point for identification, not a substitute for checking the OE number on the vehicle.

Where several OE numbers appear against one BG reference, they are supersessions or regional variants of the same specification. Ordering by A0004905300 and quoting the number on your part lets our technical team confirm the variant before despatch.

Symptoms that lead to replacing A0004905300

These complaints bring a vehicle in with the Mercedes-Benz def dosing modules under suspicion. None of them prove BG 2059003 has failed on its own, which is why the checks below matter before a replacement is ordered.

white urea crystallisation around the dosing point or mixer
low dosing pressure or pressure-build-up fault codes
SCR low-conversion codes with confirmed in-spec DEF
coolant or DEF weeping at the module interface
audible ticking absent during a commanded dose

Checks before fitting BG 2059003

Aftertreatment faults are usually system faults. Working through these checks prevents a repeat failure after the new def dosing modules is fitted.

Review exhaust temperature history — cold-side dosing wets the wall and forms deposits.
Check the cooling circuit or heat shield is intact before fitting a replacement.
Clean or replace the mixer if crystallisation is already established, or the new module will block too.
Verify commanded versus actual dosing pressure during an active dose, not at rest.
Run a quantity test and inspect the spray pattern rather than judging the injector by appearance.

Quality, packaging and ordering 2059003

BG 2059003 is manufactured and tested to aftermarket replacement standards, with electrical, leakage and functional testing carried out before packing. Bulk and retail packaging, private-label cartons and customer-specific labelling are available for distributors and workshop groups.

Send OE A0004905300 or the number printed on your part, the engine code and the vehicle identification number with your enquiry, and our technical team will confirm the correct reference, current stock position and lead time before you commit to an order.

Frequently asked questions

Does BG 2059003 replace OE A0004905300?: Yes. BG 2059003 is listed against A0004905300 and A3C0540140000. Confirm the number printed on the removed part and any manufacturer supersession before ordering.
Which vehicles does BG 2059003 fit?: Recorded coverage includes Mercedes-Benz. It is supplied as a direct-fit aftermarket def dosing modules. Adaptation, reset or relearn procedures required by the vehicle manufacturer still apply after installation.
Does this fault code always mean the def dosing modules has failed?: No. Exhaust leaks, wiring and connector damage, reductant quality, dosing performance and upstream engine faults can all produce the same codes. Validate those inputs before replacing BG 2059003.