The Component: Genuine Bosch high-performance secondary terminal locking retainer plate. 196P EMS (Engine Management System) Series taxonomy / 105-Position Signal-Side Secondary Locking Comb / Side-Loading Terminal Position Assurance (TPA) / Fitment Profile Variant (Vibrant High-Visibility Purple / Premium Glass-Reinforced PA66 GF35 / Main Housing Service Component / Component Variant Alias: 1-928-405-457 / Global Order Reference: 1928405457).

Applications & Fitment: Engineered as a critical secondary locking service component designed explicitly to interface with the signal contact sections of Bosch 196P EMS 105-way female harness connector housings (specifically part number 1928405455). This 4-pronged high-visibility purple locking comb functions as the secondary Terminal Position Assurance (TPA) mechanism for the delicate Matrix 1.2mm control lanes. Deployed extensively inside heavy-duty engine control unit (ECU) master wiring looms across European commercial vehicles, transport fleets, and agricultural machinery, it slides laterally into the side of the main connector block once the wire terminals are populated. By dropping physical blocking bars directly behind the primary clean-body terminal retention lances, it ensures that low-current signal pins remain absolutely locked in place, eliminating terminal back-out under severe powertrain vibrations, harness pull strain, and extreme road harmonics. Highly susceptible to tinned tine alignment warping or guide rail snapping if field service technicians attempt aggressive leverage extraction using un-profiled workshop metal picks instead of applying smooth, linear parallel pressure during ECU diagnostics or pinning modifications.

Technical Attributes:

- Manufacturer Part Number: 1928405457 / 1-928-405-457 (Brand: Bosch / Heavy-Duty Genuine Component Class)

- Product Series Interconnect Family: 196P EMS (Engine Management System) System Accessories

- Component Structural Type: Secondary Locking Comb Plate / Terminal Position Assurance (TPA) Side Slider

- Structural Connector Compatibility: Tailored exclusively to lock into the signal-row cavities of Bosch 105-way female plug housings (including 1928405455 and adjacent series block variants)

- Target Terminal System Layout: Secures low-current Bosch Matrix 1.2mm clean-body female micro-crimp signal socket pins firmly within the main grid

- Locking Architecture Function: Parallel blocking tines slide into position to mechanically arrest terminal movement, ensuring absolute contact alignment and zero terminal back-out

- Base Structural Compound: Premium 35% Glass-Fiber Reinforced Polyamide (PA66 GF35) engineering polymer for supreme structural tracking stiffness, rigid dimensional accuracy, and optimal impact toughness

- Color Profile: Factory Standard High-Visibility Purple (enables immediate visual QA validation of full secondary lock engagement during harness assembly or workshop service inspections)

- Environmental Isolation Level: Operates fully inside waterproof and dustproof IP-rated ECU connector enclosures when combined with the outer housing shell, mat seals, and protective wire shrouds

- Low-Voltage Circuit Threshold: Material certified safe for standard low-voltage control signal networks operating below 32V DC continuous

- Operational Thermal Window: Extended engine compartment rating certified to maintain structural tension and lock elasticity from -40°C up to +130°C

- Commercial Access: Available in standard trade repair loose piece units, sub-assembly repair packs, or bulk distributor quantities. Tiered B2B wholesale trade volume pricing breaks apply instantly inside your basket for independent garages, loom remanufacturers, and trade auto-electrical stockists.