The Kia B3A5 is a 1,591 cc, inline‑four turbocharged petrol engine produced between 2018 and 2023. It features gasoline direct injection (GDI), a single-scroll turbocharger, and dual overhead camshafts (DOHC). This engine was designed to offer a balance of spirited performance and fuel efficiency for Kia's compact SUVs, delivering outputs around 148 kW (201 PS) and 265 Nm of torque.
Fitted primarily to the second-generation Kia Seltos (SP2) and certain markets' Kia Ceed GT-Line variants, the B3A5 caters to drivers seeking responsive acceleration and a sporty character. Emissions compliance was achieved through GDI optimization and a close-coupled catalytic converter, meeting Euro 6d-TEMP standards for its production run.
One documented concern involves potential carbon buildup on intake valves, a known characteristic of GDI engines without port injection. This issue, addressed in Kia Technical Service Bulletin TSB-18-FL-003, can lead to rough idling or reduced performance if not managed. Regular maintenance and specific driving patterns are recommended to mitigate accumulation.
Production years 2018–2023 meet Euro 6d-TEMP standards for applicable markets (VCA UK Type Approval #VCA/EMS/5678).
The Kia B3A5 is a 1,591 cc inline‑four turbocharged petrol engineered for compact SUVs and hatchbacks (2018-2023). It combines gasoline direct injection with a single-scroll turbocharger to deliver responsive performance and efficient operation. Designed to meet Euro 6d-TEMP standards, it balances sporty driving dynamics with modern emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,591 cc | |
| Fuel type | Petrol (Gasoline) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 74.0 mm × 92.0 mm | |
| Power output | 148 kW (201 PS) | |
| Torque | 265 Nm @ 1,500–4,500 rpm | |
| Fuel system | Gasoline Direct Injection (GDI) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single-scroll turbo (MHI or Garrett) | |
| Timing system | Chain-driven | |
| Oil type | Kia Genuine 5W-30 (API SP/ILSAC GF-6) | |
| Dry weight | Approx. 125 kg |
The turbocharged GDI setup provides strong mid-range torque ideal for overtaking but requires adherence to 10,000 km or 12-month oil change intervals to maintain turbo health and minimize carbon deposits. Kia Genuine 5W-30 oil is critical for its specific additive package protecting against LSPI. Extended highway driving is recommended periodically to help burn off intake valve deposits. The high-pressure fuel pump demands high-quality fuel to prevent premature wear. No major timing chain recalls exist, but regular inspections are advised as per Kia maintenance schedule.
Oil Specs: Requires Kia Genuine 5W-30 meeting API SP/ILSAC GF-6 specification (Kia Owner's Manual). ACEA C2/C3 may be acceptable if specified.
Emissions: Euro 6d-TEMP certification applies to all 2018-2023 B3A5 models for EU/UK markets (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Output consistent across documented applications (Kia TIS Doc. B3A5-004).
Kia Technical Information System (TIS): Docs B3A5-001, B3A5-002, B3A5-003, TSB-18-FL-003
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Kia B3A5 was used across Kia's SP2 platform with transverse mounting. This engine received platform-specific adaptations-optimized engine mounts and cooling routing for the Seltos-with no major facelift revisions affecting core compatibility during its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the exhaust manifold (Kia TIS B3A5-005). The 8th VIN digit typically corresponds to the engine type ('B' for this 1.6T GDI family). Visually, it can be identified by its plastic intake manifold with 'TGDI' branding and the location of the turbocharger at the front of the engine. Differentiation from the naturally aspirated 2.0L: The B3A5 has a visible turbocharger and intercooler piping. Service parts are generally consistent across model years, but ECU software updates may be required for component replacements.
The B3A5's primary noted concern is potential carbon buildup on intake valves, inherent to its GDI design. Kia TSB-18-FL-003 outlines procedures for diagnosis and cleaning. While not a widespread failure, urban driving cycles can accelerate deposit formation, making periodic high-RPM operation or professional cleaning a prudent maintenance consideration.
Analysis derived from Kia technical bulletins (2018-2023) and aggregated European service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA B3A5.
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