Urea (AdBlue) Dosing Module for Mack / Renault Trucks / Volvo FH / FM / FMX – OE 7421738134

BG 205030 (OE 7421738134): function on the vehicle

Urea (AdBlue) Dosing Module for Mack / Renault Trucks / Volvo FH / FM / FMX – OE 7421738134 is supplied by BEST GROWTH under part number 205030, cross-referenced to OE 7421738134, as a direct-fit aftermarket def dosing modules. In service it is the final actuator of the SCR loop: whatever the controller calculates from the NOx signal is only delivered as accurately as this module sprays it.

BG 205030 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.

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 Renault Trucks, Volvo and Mack and OE cross reference

BG 205030 replaces 9 OE references: 7421738134, 0 444 023 053, 21738138, 74 21 234 248, 74 21 738 134, 21234247, 21399653, 21738132 and 21575008. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 205030 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 7421738134 and quoting the number on your part lets our technical team confirm the variant before despatch.

Symptoms that lead to replacing 7421738134

These complaints bring a vehicle in with the Renault Trucks and Volvo def dosing modules under suspicion. None of them prove BG 205030 has failed on its own, which is why the checks below matter before a replacement is ordered.

• audible ticking absent during a commanded dose
• deposits inside the mixer restricting exhaust flow
• 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

Checks before fitting BG 205030

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 205030

BG 205030 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 7421738134 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 205030 replace OE 7421738134?

Yes. BG 205030 is listed against 7421738134, 0 444 023 053, 21738138, 74 21 234 248, 74 21 738 134, 21234247, 21399653 and 21738132. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 205030 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 205030.