Does BG 205028 replace OE 21647145?

Yes. BG 205028 is listed against 21647145, 74 21 574 987 and 74 21 644 763. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 205028 fit?

Recorded coverage includes Renault Trucks, Volvo and Mack. 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 205028.

205028

Urea (AdBlue) Dosing Module for Mack; Renault Trucks; Volvo FH / FM / FMX – OE 21647145

Urea (AdBlue) Dosing Module (OE 21647145) for Mack; Renault Trucks; Volvo FH / FM / FMX SCR/AdBlue aftertreatment systems. Cross-referenced with 2 alternate OE numbers.

BG Part Number: 205028
Category: DEF Dosing Modules
Application: Mack; Renault Trucks; Volvo FH|FM|FMX
Vehicle Manufacturer: Renault Trucks|Volvo|Mack

Applications

Truck

OE Cross References

21647145
74 21 574 987
74 21 644 763

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Product Description

This urea (adblue) dosing module is designed as a direct-fit replacement for Mack; Renault Trucks; Volvo FH / FM / FMX. 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: 21647145. It also cross-references to OE/aftermarket numbers including 74 21 574 987, 74 21 644 763. 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 fleets, workshops and parts distributors 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 205028 (OE 21647145): function on the vehicle

Urea (AdBlue) Dosing Module for Mack; Renault Trucks; Volvo FH / FM / FMX – OE 21647145 is supplied by BEST GROWTH under part number 205028, cross-referenced to OE 21647145, 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 205028 is built to the position defined by its OE application in truck service on platforms from Renault Trucks, Volvo and Mack. Position, calibration and connector layout are part of the specification, so a part that physically fits is not automatically the correct part.

Seal and gasket condition at the exhaust interface is part of the repair: a leaking joint cools the spray zone and promotes crystallisation.

Fitment for Renault Trucks, Volvo and Mack and OE cross reference

BG 205028 replaces 3 OE references: 21647145, 74 21 574 987 and 74 21 644 763. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 205028 includes Renault Trucks, Volvo and Mack, typically on Mack; Renault Trucks; Volvo FH|FM|FMX. 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 21647145 and quoting the number on your part lets our technical team confirm the variant before despatch.

Symptoms that lead to replacing 21647145

These complaints bring a vehicle in with the Renault Trucks and Volvo def dosing modules under suspicion. None of them prove BG 205028 has failed on its own, which is why the checks below matter before a replacement is ordered.

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
deposits inside the mixer restricting exhaust flow

Checks before fitting BG 205028

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

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.
Confirm the purge cycle completes at shutdown; skipped purges cause freeze damage.
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.

Quality, packaging and ordering 205028

BG 205028 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 21647145 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 205028 replace OE 21647145?: Yes. BG 205028 is listed against 21647145, 74 21 574 987 and 74 21 644 763. Confirm the number printed on the removed part and any manufacturer supersession before ordering.
Which vehicles does BG 205028 fit?: Recorded coverage includes Renault Trucks, Volvo and Mack. 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 205028.