Does BG 201991 replace OE GC46-5L248-BB?

Yes. BG 201991 is listed against GC46-5L248-BB and SNS1020A. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 201991 fit?

Recorded coverage includes Ford. It is supplied as a direct-fit aftermarket nox sensors on 24V systems. Adaptation, reset or relearn procedures required by the vehicle manufacturer still apply after installation.

Does this fault code always mean the nox sensors 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 201991.

201991

NOx Sensor GC46-5L248-BB

BG NOx sensor for FORDF-MAX / Cargo Euro 6,OE GC46-5L248-BB,24V urea/SCR system.

BG Part Number: 201991
Category: NOx Sensors
Application: F-MAX / Cargo Euro 6
Voltage: 24V
Vehicle Manufacturer: FORD

OE Cross References

GC46-5L248-BB
SNS1020A· cross

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Product Description

This BG NOx (nitrogen oxide) sensor is designed for the urea/AdBlue-based SCR (Selective Catalytic Reduction) emissions system on FORD F-MAX / Cargo Euro 6. It is a direct-fit replacement for OE reference GC46-5L248-BB / cross reference SNS1020A. Rated for 24V electrical systems. The sensor provides accurate real-time NOx measurement for precise urea dosing control, helping maintain stable SCR performance and compliance with diesel emission standards.

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 201991 (OE GC46-5L248-BB): function on the vehicle

NOx Sensor GC46-5L248-BB is supplied by BEST GROWTH under part number 201991, cross-referenced to OE GC46-5L248-BB, as a direct-fit aftermarket nox sensors. In service it acts as the closed-loop feedback element of the SCR circuit: it tells the controller how much NOx is still leaving the catalyst, so dosing is trimmed up or down instead of running to a fixed map.

BG 201991 is built to the position defined by its OE application on a 24V electrical system on the platform from Ford. Position, calibration and connector layout are part of the specification, so a part that physically fits is not automatically the correct part.

Cable length and connector keying are part of the specification. A cell with correct electrical output but the wrong lead length will not route to the OE bracket.

Fitment for Ford and OE cross reference

BG 201991 replaces 2 OE references: GC46-5L248-BB and SNS1020A, covering cross applications. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 201991 includes Ford, typically on F-MAX / Cargo Euro 6. 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 GC46-5L248-BB and quoting the number on your part lets our technical team confirm the variant before despatch.

Symptoms that lead to replacing GC46-5L248-BB

These complaints bring a vehicle in with the Ford nox sensors under suspicion. None of them prove BG 201991 has failed on its own, which is why the checks below matter before a replacement is ordered.

dosing shut-down after a few minutes of steady-state running
upstream and downstream values reading almost identically under load
intermittent fault that clears after the engine cools and returns when hot
SCR efficiency below threshold or NOx-signal-implausible fault codes
DEF over-consumption with no visible leak

Checks before fitting BG 201991

Aftertreatment faults are usually system faults. Working through these checks prevents a repeat failure after the new nox sensors is fitted.

Inspect the harness for heat damage and the connector for moisture and green corrosion.
Check for exhaust leaks ahead of the sensor boss; a diluted sample reads low NOx.
Read the sensor's own dew-point release time — a cell that never heats is a supply or module fault.
Verify DEF concentration with a refractometer before blaming the measuring cell.
Check for a pending software or parameter update for the sensor control module on that platform.

Quality, packaging and ordering 201991

BG 201991 is manufactured and tested to aftermarket replacement standards, with electrical, leakage and functional testing carried out before packing on the 24V specification. Bulk and retail packaging, private-label cartons and customer-specific labelling are available for distributors and workshop groups.

Send OE GC46-5L248-BB 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 201991 replace OE GC46-5L248-BB?: Yes. BG 201991 is listed against GC46-5L248-BB and SNS1020A. Confirm the number printed on the removed part and any manufacturer supersession before ordering.
Which vehicles does BG 201991 fit?: Recorded coverage includes Ford. It is supplied as a direct-fit aftermarket nox sensors on 24V systems. Adaptation, reset or relearn procedures required by the vehicle manufacturer still apply after installation.
Does this fault code always mean the nox sensors 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 201991.