NOx Sensor 55512350

BG 990664 (OE 55512350): function on the vehicle

NOx Sensor 55512350 is supplied by BEST GROWTH under part number 990664, cross-referenced to OE 55512350, 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 990664 is built to the position defined by its OE application on a 12V electrical system in passenger car service on the platform from GM. 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 GM and OE cross reference

BG 990664 replaces 2 OE references: 55512350 and SNS0498A, covering cross applications. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 990664 includes GM, typically on Mokka X 1.4T 2018-. 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 55512350 and quoting the number on your part lets our technical team confirm the variant before despatch.

Symptoms that lead to replacing 55512350

These complaints bring a vehicle in with the GM nox sensors under suspicion. None of them prove BG 990664 has failed on its own, which is why the checks below matter before a replacement is ordered.

• DEF over-consumption with no visible leak
• torque derate or speed inducement with a full, in-spec DEF tank
• 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

Checks before fitting BG 990664

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 990664

BG 990664 is manufactured and tested to aftermarket replacement standards, with electrical, leakage and functional testing carried out before packing on the 12V specification. Bulk and retail packaging, private-label cartons and customer-specific labelling are available for distributors and workshop groups.

Send OE 55512350 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 990664 replace OE 55512350?

Yes. BG 990664 is listed against 55512350 and SNS0498A. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 990664 fit?

Recorded coverage includes GM. It is supplied as a direct-fit aftermarket nox sensors on 12V 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 990664.