BG Technical Knowledge Center
Practical technical articles, diagnostic procedures and system guides covering NOx sensors, DEF dosing, SCR, DOC and DPF systems for the independent automotive aftermarket.
Article series
SCR System Series · Part 01
Air-assisted first-generation DEF dosing: how it works, key components, application references and fault-investigation paths.
SCR System Series · Part 02
Airless DEF dosing, cooling-return configurations, components, application evidence and diagnostic checks.
SCR System Series · Part 03
Separate DEF and coolant circuits, catalogue specifications, qualified OE examples and evidence-based diagnosis.
SCR & DEF Systems
A practical system-first guide to SCR and DEF fault diagnosis for workshops, fleets and distributors across Europe, North America and South America.
Find system fundamentals, diagnostic guidance and component-level technical information.
Filter operation, soot and ash management, regeneration and exhaust restriction diagnosis.
Explore topicNOx reduction, DEF delivery, dosing control, catalyst operation and common SCR faults.
Explore topicNOx, EGT, PM and pressure-sensor functions, live-data interpretation and fault diagnosis.
Explore topicPassive, active, forced and off-vehicle regeneration procedures and service decisions.
Explore topicA system-level approach to dosing faults, sensor errors, catalyst efficiency and inducement.
Explore topicSCR & DEF Systems
A practical system-first guide to SCR and DEF fault diagnosis for workshops, fleets and distributors across Europe, North America and South America.
SCR & DEF Systems
A workshop-focused guide to DEF injector types, operating principles, crystallization, testing, cleaning, replacement decisions and repair-kit suitability.
Company News / Exhibitions
At Automechanika Frankfurt 2026, Best Growth welcomed long-term customers and new industry partners to discuss diesel aftertreatment challenges, market opportunities and practical product solutions.
SCR & DEF Systems
A system-level guide to diesel exhaust treatment—from DOC and DPF filtration to DEF dosing, SCR conversion, sensors, fault diagnosis and application-correct replacement parts.
NOx Sensors
A practical guide to how nitrogen oxide (NOx) sensors work, where they are installed, how they support SCR dosing and OBD, and how to diagnose faults before choosing a replacement.
Core system guides for diesel aftertreatment technicians and workshops.
How DOC, DPF, SCR, DEF dosing and sensors work together as one emission-control system.
Read guideHow a diesel particulate filter system works, its components and warning signs.
Read guidePassive, active, forced and off-vehicle regeneration — and why regeneration fails.
Read guideA practical comparison of the three principal aftertreatment stages and what each one controls.
Read guideSCR chemistry, DEF/AdBlue delivery and the role of the SCR catalyst.
Read guideNOx sensor, doser, pump and catalyst issues and how to diagnose them.
Read guideWhat a NOx sensor does, upstream vs downstream roles, failure symptoms and the test procedure.
Read guideSymptoms, live-data checks and validation steps to run before replacing a NOx sensor.
Read guideWhy SCR efficiency drops, catalyst testing and the parts needed to repair P20EE.
Read guideNOx sensor performance-code diagnosis, testing and replacement selection.
Read guideDEF/AdBlue system performance faults, pump pressure and doser inspection.
Read guideNOx sensor circuit range fault testing and the right BG replacement.
Read guideDPF, SCR, DOC, NOx sensor and urea system engineering content — one email per new article. No marketing, unsubscribe any time.
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