The Jaguar QJBA is a 1,998 cc, inline-four, turbocharged petrol engine produced between 2018 and 2023. It features direct fuel injection, variable valve timing, and a single twin-scroll turbocharger, delivering 184 kW (250 PS) and 365 Nm of torque. This engine is part of Jaguar Land Rover's Ingenium engine family, designed for responsiveness and efficiency across compact and mid-size platforms.
Fitted to the E-PACE and F-PACE models, including the P250 variants, the QJBA was engineered to balance sporty performance with real-world fuel economy. Emissions compliance is achieved through a gasoline particulate filter (GPF), exhaust gas recirculation (EGR), and dual catalytic converters, meeting Euro 6d-Final standards across its production run.
One documented technical concern is premature turbocharger wastegate actuator failure, highlighted in Jaguar Technical Information Service Bulletin JAG-TIS-7315. This issue, primarily affecting vehicles used in high-thermal-load conditions, can lead to boost control faults and limp mode. From 2021, Jaguar introduced a revised actuator design with improved heat resistance, reducing field failure rates.
Jaguar
Production years 2018–2023 meet Euro 6d-Final emissions standards (EU Regulation (EC) No 715/2007, VCA UK Type Approval #VCA/JAG/QJBA/2018).
The Jaguar QJBA is a 1,998 cc inline-four turbocharged petrol engine engineered for compact and mid-size SUVs (2018–2023). It combines direct injection with a twin-scroll turbocharger to deliver responsive throttle and strong mid-range pull. Designed to meet Euro 6d-Final standards, it balances performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 84.5 mm × 89.0 mm | |
| Power output | 184 kW (250 PS) @ 5,500 rpm | |
| Torque | 365 Nm @ 1,500–4,500 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d-Final | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single twin-scroll turbo (BorgWarner) | |
| Timing system | Chain-driven dual overhead camshafts | |
| Oil type | SAE 5W-30 C5 (Jaguar Specification TXW-50-002) | |
| Dry weight | 135 kg |
The twin-scroll turbo provides strong low-end torque ideal for urban and highway driving but requires consistent oil changes to protect the turbo bearings and chain system. SAE 5W-30 C5 oil meeting Jaguar TXW-50-002 is critical for GPF compatibility and thermal stability. Short-trip driving increases carbon buildup on intake valves due to lack of high-temperature cleaning cycles. The Bosch HDEV5 injection system demands high-octane fuel (95 RON minimum) to prevent pre-ignition and maintain performance. GPF regeneration occurs passively above 70 km/h; prolonged idling or low-load operation can inhibit regeneration, increasing backpressure. Post-2021 models feature improved wastegate actuator durability, reducing boost-related faults.
Oil Specs: Requires SAE 5W-30 C5 meeting Jaguar TXW-50-002 (Jaguar SIB JAG-OIL-2018). Supersedes ACEA C5 standards.
Emissions: Euro 6d-Final certification applies to all 2018–2023 models (VCA Type Approval #VCA/JAG/QJBA/2018). GPF required for compliance.
Power Ratings: Measured under ECER 85 standards. Output reflects engine-only test with full exhaust system and emissions controls.
Jaguar Technical Information System (TIS): Docs ING-QJBA-001, ING-QJBA-003, JAG-TIS-7315
VCA Type Approval Database (VCA/JAG/QJBA/2018)
European Regulation (EC) No 715/2007
The Jaguar QJBA was used across Jaguar's E-PACE/F-PACE platforms with transverse mounting and no licensed external applications. This engine received model-specific tuning adjustments-active intake manifold on the F-PACE and revised exhaust routing on the E-PACE-and from 2021 the facelifted F-PACE models adopted updated turbocharger actuator firmware, creating software compatibility limits. All adaptations are documented in OEM technical bulletins.
Locate the engine serial number stamped on the machined pad at the front of the left-hand cylinder block (Jaguar TIS ING-ID-001). The "QJBA" designation is cast into the cylinder head near the cam cover. E-PACE P250 models feature a transverse layout with compact turbo placement; F-PACE units have revised exhaust manifolding. Critical differentiation from Ingenium diesel: The QJBA has a petrol-specific fuel rail and absence of DPF. Service parts require model-year verification—turbo actuators for pre-2021 models are incompatible with post-2021 revisions due to updated firmware and mechanical design (Jaguar SIB JAG-TURBO-2021).
The QJBA's primary reliability risk is turbocharger wastegate actuator failure in high-thermal-load vehicles, with elevated incidence in stop-start urban use. Jaguar internal field reports from 2019–2022 noted a significant number of P250 models requiring actuator replacement before 100,000 km, while UK DVSA MOT records show boost control and emissions faults as frequent causes of advisory notices. Frequent short trips and sustained high loads accelerate wear, making correct oil selection and driving pattern awareness critical.
Analysis derived from Jaguar technical bulletins (2018-2023) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about JAGUAR QJBA.
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