Trucking Guides, News & Insights | Wisent Parts Center
News, guides, and insights for anyone who works on or runs diesel equipment, from big rigs and diesel pickups to heavy machinery.
Truck Parts Buying Guides
View all 0 postsPractical buying guides for heavy-duty truck parts: rebuilt vs remanufactured, part number cross-references, turbochargers, and how to confirm fitment.
Fault Codes Explained
View all 3 postsHeavy-duty diesel fault codes explained: what each SPN means, likely causes, symptoms, and repair steps for Cummins, Detroit, Paccar, Volvo, and International.
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SCR NOx Conversion Efficiency: SPN 4364 Explained
Fault Codes SCR & DEF SPN 4364 Detroit - Cummins - Paccar - Volvo SCR NOx Conversion Efficiency:SPN 4364 Explained Updated July 2026 - 16 min read - Heavy-Duty Diesel...
SCR NOx Conversion Efficiency: SPN 4364 Explained
Fault Codes SCR & DEF SPN 4364 Detroit - Cummins - Paccar - Volvo SCR NOx Conversion Efficiency:SPN 4364 Explained Updated July 2026 - 16 min read - Heavy-Duty Diesel...
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VGT Turbo Actuator Fault Codes: SPN 641 Explained
Fault Codes Turbocharger SPN 641 Cummins - Volvo - Freightliner - International VGT Turbo Actuator Fault Codes:SPN 641 Explained Updated June 2026 - 8 min read - Heavy-Duty Diesel...
VGT Turbo Actuator Fault Codes: SPN 641 Explained
Fault Codes Turbocharger SPN 641 Cummins - Volvo - Freightliner - International VGT Turbo Actuator Fault Codes:SPN 641 Explained Updated June 2026 - 8 min read - Heavy-Duty Diesel...
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DPF Differential Pressure: SPN 3251 Explained
Fault Codes Aftertreatment SPN 3251 Cummins - Detroit - International - Volvo DPF Differential Pressure:SPN 3251 Explained Updated July 2026 - 14 min read - Heavy-Duty Diesel Trucks SPN 3251...
DPF Differential Pressure: SPN 3251 Explained
Fault Codes Aftertreatment SPN 3251 Cummins - Detroit - International - Volvo DPF Differential Pressure:SPN 3251 Explained Updated July 2026 - 14 min read - Heavy-Duty Diesel Trucks SPN 3251...