NOx Sensor 51.15408-0016

BG 201144 (OE 51.15408-0016): function on the vehicle

NOx Sensor 51.15408-0016 is supplied by BEST GROWTH under part number 201144, cross-referenced to OE 51.15408-0016, 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 201144 is built to the position defined by its OE application on a 24V electrical system in truck service on the platform from MAN. Position, calibration and connector layout are part of the specification, so a part that physically fits is not automatically the correct part.

The measuring cell is consumable. Soot loading, silicone contamination and repeated thermal shock all shorten its life, which is why a sensor can drift for months before it sets a hard code.

Fitment for MAN and OE cross reference

BG 201144 replaces 4 OE references: 51.15408-0016, 5115408-0016, 5WK9 6721B and 5WK96721B, covering cross applications. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 201144 includes MAN, typically on TGX / TGS / TGL / TGM Truck. 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 51.15408-0016 and quoting the number on your part lets our technical team confirm the variant before despatch.

Symptoms that lead to replacing 51.15408-0016

These complaints bring a vehicle in with the MAN nox sensors under suspicion. None of them prove BG 201144 has failed on its own, which is why the checks below matter before a replacement is ordered.

• no communication with the sensor control module after a cold start
• sensor value frozen at a fixed number once the exhaust warms up
• 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

Checks before fitting BG 201144

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 201144

BG 201144 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 51.15408-0016 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 201144 replace OE 51.15408-0016?

Yes. BG 201144 is listed against 51.15408-0016, 5115408-0016, 5WK9 6721B and 5WK96721B. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 201144 fit?

Recorded coverage includes MAN. 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 201144.