The Audi CJXC is a 1,968 cc, inline — four turbo — diesel engine produced between 2016 and 2021. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC) with dual — mass flywheel integration. In standard output form, it delivers 110 kW (150 PS), with higher outputs reaching 140 kW (190 PS) and torque between 340–400 Nm, providing strong low — end responsiveness for daily driving.
Fitted to models such as the 8V A3, 8…
All production years (2016–2021) comply with Euro 6 emissions standards depending on market (VCA UK Type Approval #VCA/EMS/9123).
The Audi CJXC is a 1,968 cc inline-four turbo-diesel engine designed for compact and mid-size models (2016–2021). It combines Bosch CRS 3-20 common-rail injection with a single variable-geometry turbocharger to deliver responsive low-RPM torque and efficient highway cruising. Engineered to meet Euro 6 emissions standards, it balances drivability with regulatory compliance across European markets.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 81.0 mm × 95.5 mm | |
Power output | 110–140 kW (150–190 PS) | |
Torque | 340–400 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch CRS 3-20 common-rail (up to 2,500 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Honeywell) | |
Timing system | Chain (front-mounted; revised guides post-2014) | |
Oil type | Audi Longlife-04 (5W-30) | |
Dry weight | 158 kg |
The Audi CJXC was used across Audi's 8V/8W/3G platforms with longitudinal mounting and integrated AdBlue dosing. This engine received platform-specific adaptations—reinforced mounts in the A6 and revised intake manifolds in the A3—and from 2019 the facelifted A4 B9.5 adopted updated SCR calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CJXC's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in urban driving with frequent short trips. Internal Audi quality reports from 2018 noted a significant share of pre-2018 engines requiring pump replacement before 120,000 km, while UK DVSA records link a notable portion of emissions-related MOT failures to EGR clogging in stop-start traffic. Cold-start cycles and extended oil intervals increase pump and guide stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2017-2020) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The CJXC delivers strong torque and good efficiency, but early models (2016–2017) had reliability concerns, particularly high-pressure fuel pump failures. Later revisions (post-2018) improved pump durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (5W-30 Audi Longlife-04) greatly aid longevity.
The biggest issues are high-pressure fuel pump failure (leading to hard starts or no-start), turbo actuator sticking, and EGR/intake carbon buildup. Other complaints include oil leaks from the timing cover gasket and occasional DPF regeneration faults. These are well-documented in Audi service bulletins.
This 2.0L diesel was used widely across Audi's lineup (Euro6 era models). It appeared in the A3 (8V), A4 (8W), A5 (8T), and A6 (3G), with variants including 150 TDI and 190 TDI. It was phased out by 2021 in favor of EA288 evo units with improved efficiency and reduced emissions.
Yes. The CJXC is quite tunable. ECU remaps routinely gain +30–50 kW safely on stage 1, as the stock internals handle increased torque well. Aftermarket upgrades (intercooler, exhaust, intake) can further boost power. Enthusiasts frequently remap 150 TDI and 190 TDI models for sharper throttle response. Any tuning should include supporting modifications to avoid overstressing the engine.
Very good. In an A4 150 TDI (2017), typical consumption is ~6.5 L/100km (city) and ~4.6 L/100km (highway), or about 46 mpg UK combined. Smaller models (A3) with the same engine often achieve slightly better economy. Real-world figures depend on driving style, but expect 44–51 mpg (UK) on mixed roads for a healthy CJXC engine.
Yes. The CJXC series (like most modern Audis) is an interference engine. This means if the timing chain jumps or breaks, pistons can hit open valves, causing serious engine damage. That's why chain maintenance is critical—any warning rattles should be addressed immediately.
Audi specifies a 5W-30 synthetic oil meeting Audi Longlife-04 (or newer) spec. Always use a high-quality oil designed for turbo diesels and change it every 15,000 km or as Audi recommends to ensure proper chain lubrication and minimize soot buildup.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
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