NOx Sensor 55570096

BG 201672 (OE 55570096): function on the vehicle

NOx Sensor 55570096 is supplied by BEST GROWTH under part number 201672, cross-referenced to OE 55570096, as a direct-fit aftermarket nox sensors. In service it measures nitrogen-oxide concentration and residual oxygen in the exhaust stream and reports both values to the aftertreatment controller over the vehicle data bus. Upstream and downstream readings together set DEF dosing quantity and score SCR conversion efficiency.

BG 201672 is built to the position defined by its OE application on a 12V electrical system in light commercial vehicle 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 201672 replaces 2 OE references: 55570096 and 5WK96708A, covering cross applications. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 201672 includes GM, typically on Silverado 1500 2.7L 2019-. 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 55570096 and quoting the number on your part lets our technical team confirm the variant before despatch.

Symptoms that lead to replacing 55570096

These complaints bring a vehicle in with the GM nox sensors under suspicion. None of them prove BG 201672 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 201672

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

• Compare upstream and downstream NOx readings warmed and under load — idle values prove nothing.
• Confirm supply voltage, ground quality and bus termination before condemning the sensor module.
• 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.

Quality, packaging and ordering 201672

BG 201672 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 55570096 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 201672 replace OE 55570096?

Yes. BG 201672 is listed against 55570096 and 5WK96708A. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 201672 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 201672.