Volkswagen DFGA Specifications
| Engine Model: Volkswagen DFGA |
| Engine Type: 4-cycle 4-cylinder DOHC 16-valve turbocharged liquid-cooled diesel |
| Total Displacement: 120.1 cu.in (1.96 L) |
| Rated Engine Power: 148 Hp (110 kW) at 4000 rpm |
| Fuel System Type: Common rail direct injection |
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The Volkswagen DFGA is a 2.0-liter, inline-four
turbocharged diesel engine (TDI) belonging to the EA288 engine family,
introduced in approximately 2016 as a cornerstone of Volkswagen Group’s modern
diesel strategy. Developed as the successor to the EA189 series, the EA288
architecture was engineered to deliver improved fuel efficiency, reduced
internal friction, and full compliance with Euro 6 emissions standards through
the integration of advanced aftertreatment systems.
The DFGA variant represents the 150 PS (110 kW) output calibration within the
EA288 family, positioned as a versatile mid-range diesel powerplant deployed
across a wide array of Volkswagen Group vehicles built on the MQB (Modular
Transverse Matrix) platform. The engine features a cast-iron cylinder block - a
departure from the aluminum construction of some EA288 variants - paired with an
aluminum cylinder head incorporating dual overhead camshafts (DOHC) and four
valves per cylinder.
A Bosch common rail fuel system operating at up to 2,000 bar (29,000 psi)
delivers precise fuel metering, while a variable geometry turbocharger (VGT)
provides responsive boost across the operating range. Selective catalytic
reduction (SCR) with AdBlue injection, combined with a diesel particulate filter
(DPF), enables the DFGA to meet stringent nitrogen oxide (NOx) and particulate
matter limits.
The DFGA is a 4-stroke, inline 4-cylinder, water-cooled diesel engine utilizing
a dual overhead camshaft (DOHC) valvetrain with four valves per cylinder,
totaling 16 valves. Total displacement is 1.968 Liters (1,968 cc / 120.1 cu.in),
derived from a bore of 81.0 mm (3.189 in) and a long stroke of 95.5 mm (3.760
in). The undersquare bore-to-stroke ratio favors low-end torque production and
thermal efficiency, characteristics well-suited to diesel combustion. The
compression ratio is set at 16.2:1. Maximum power output is 110 kW (150 PS / 148
hp) delivered between 3,500 and 4,000 RPM.
Peak torque ranges from 320 to 340 Nm (236-251 lb-ft) depending on vehicle
application and calibration, achieved across a broad plateau from 1,750 to 3,000
RPM. The firing order follows 1-3-4-2. The engine management system is a Bosch
electronic control unit (ECU) integrating fuel injection, boost pressure
control, exhaust gas recirculation (EGR), and aftertreatment management. The
engine is homologated to Euro 6 emissions standards, utilizing a combination of
high- and low-pressure EGR, DPF, and SCR with AdBlue injection.
The cylinder block is constructed from cast iron with a
closed-deck design, a material selection that provides the rigidity required to
contain the high cylinder pressures generated by modern common rail diesel
systems operating at up to 2,000 bar (29,000 psi). The block features siamese
bores with a finished bore diameter of 81.0 mm (3.189 in).
The deep-skirt design extends below the crankshaft centerline, minimizing
vibration and contributing to the engine’s noise, vibration, and harshness (NVH)
characteristics. The crankshaft is forged from micro-alloy steel and is
supported by five main bearings. Connecting rods are forged steel with a
fractured-cap design ensuring precise bearing alignment.
Pistons are cast aluminum with a bowl-in-crown combustion chamber geometry
optimized for direct injection. The piston rings include a top compression ring
with a wear-resistant coating to accommodate the elevated cylinder pressures.
Piston cooling jets (oil squirters) are integrated into the crankcase, directing
oil to the piston undersides to manage thermal loads under sustained high-load
operation. The cylinder block incorporates a balancer shaft module in certain
applications to mitigate secondary vibrations.
The cylinder head is manufactured from aluminum alloy
and features a cross-flow design with four valves per cylinder - two intake and
two exhaust - arranged in a pent-roof combustion chamber configuration. The dual
overhead camshafts (DOHC) are driven by a rubber timing belt from the
crankshaft. The camshafts operate the valves through roller finger followers
with hydraulic lash adjusters integrated into the assembly.
Valve diameters measure 29.0 mm (1.142 in) for intake and 26.0 mm (1.024 in) for
exhaust. The hydraulic lash adjusters are self-adjusting, eliminating the need
for manual valve clearance adjustments for the engine’s service life. The intake
camshaft is equipped with a camshaft phaser that provides variable valve timing
to optimize charge motion and EGR compatibility across the operating range.
The combustion chambers feature a compact design with a centrally located
injector nozzle and a high-swirl intake port geometry that promotes air-fuel
mixing and efficient combustion. The exhaust ports are integrated into a compact
manifold configuration that reduces weight and shortens the distance to the
turbocharger, improving transient response.
The fuel system is a high-pressure common rail direct
injection system manufactured by Bosch, operating at pressures up to 2,000 bar
(29,000 psi). A high-pressure fuel pump, driven by the timing belt, supplies
fuel to the common rail accumulator. The rail distributes fuel to solenoid-type
injectors - one per cylinder - which are capable of multiple injection events
per combustion cycle, including pilot injections for noise reduction, main
injection for power delivery, and post-injections for DPF regeneration.
The injection timing, duration, and pressure are continuously controlled by the
engine control unit based on input from the crankshaft position sensor, camshaft
position sensor, boost pressure sensor, air mass meter, and exhaust gas sensors.
A fuel temperature sensor integrated into the pump allows the ECU to compensate
for fuel density variations. The fuel filtration system incorporates a water
separator with a sensor that alerts the operator when accumulated water requires
draining.
The lubrication system is a full-flow, pressurized
design utilizing a gear-type oil pump mounted to the front of the crankshaft
within the timing cover. The oil pump is of the variable-displacement design,
adjusting flow based on engine speed and load to reduce parasitic losses and
improve fuel efficiency. Total oil capacity is 4.7 Liters (5.0 qt) including the
filter.
A water-cooled oil cooler is integrated into the oil filter mounting assembly,
maintaining oil temperature within the optimal range under sustained high-load
operation. The lubrication circuit supplies oil to the crankshaft main bearings,
connecting rod bearings, camshaft bearings, hydraulic lash adjusters, timing
belt tensioner, and turbocharger bearing housing.
Oil pressure at operating temperature ranges
from 2.0-4.0 bar (29-58 psi) across the normal engine speed range. The
recommended oil is 5W-30 fully synthetic meeting Volkswagen
specification VW 507.00, a low-ash formulation required to protect the
DPF from premature ash loading.
The cooling system is a water-cooled, pressurized
design utilizing a belt-driven centrifugal water pump mounted to the front of
the engine block. The system incorporates a thermal management module - a rotary
valve thermostat assembly - that enables the engine control unit to actively
regulate coolant flow to the cylinder head, cylinder block, and radiator based
on operating conditions. This technology reduces warm-up time, improves fuel
efficiency, and optimizes thermal conditions for emissions control.
Total coolant capacity ranges from 7.0-8.5 Liters (7.4-9.0 qt) depending on
vehicle platform, heater core configuration, and the presence of a rear heater.
The cooling fan is an electric unit with pulse-width modulation (PWM) control.
The charge air cooler is an air-to-air unit mounted in the front grille area,
sized to maintain intake air temperatures within the optimal range for
combustion efficiency and emissions control.
The Variable Geometry Turbocharger (VGT) unit features
a set of movable vanes surrounding the turbine wheel. The vane position is
controlled by an electric actuator or vacuum-actuated diaphragm based on signals
from the ECU. At low engine speeds, the vanes close to increase exhaust gas
velocity and improve transient response; at high speeds, the vanes open to
reduce backpressure and prevent overspeed. The VGT system eliminates the need
for a wastegate and contributes to the engine’s broad torque plateau.
Timing System: The camshafts are driven by a rubber
timing belt with reinforced fiber cord. The belt routes around the crankshaft
sprocket, tensioner pulley, idler pulley, and both camshaft sprockets. An
automatic spring-loaded tensioner with a hydraulic damper maintains correct belt
tension throughout the service interval. The engine is an interference design:
timing belt failure results in piston-to-valve contact, requiring cylinder head
removal for repair. The water pump is driven by the same timing belt, requiring
concurrent replacement during belt service.
Exhaust Aftertreatment System: The engine employs a comprehensive emissions
control strategy to achieve Euro 6 compliance. A high-pressure exhaust gas
recirculation (EGR) system routes a portion of exhaust gases through a cooler to
the intake manifold, reducing combustion temperatures and suppressing NOx
formation. A low-pressure EGR system, introduced on EA288 engines, recirculates
exhaust gases after the DPF to further reduce NOx while maintaining charge air
cleanliness.
A diesel oxidation catalyst (DOC) oxidizes
unburned hydrocarbons and carbon monoxide. A diesel particulate filter
(DPF) traps soot particles and periodically regenerates through
post-injection fuel events. Selective catalytic reduction (SCR) with
AdBlue injection converts NOx into nitrogen and water vapor downstream
of the DPF. An ammonia slip catalyst (ASC) prevents excess ammonia from
entering the atmosphere.
Length measured from the front accessory drive face to
the transmission mounting flange is 620 mm (24.4 in). Width across the cylinder
head, intake manifold, and turbocharger assembly measures 680 mm (26.8 in).
Height from the oil pan bottom surface to the top of the valve cover is 720 mm
(28.3 in). The dry weight of the fully dressed engine - including the intake
manifold, turbocharger, fuel system components, and accessory drives - is 145 kg
(320 lb).
The DFGA requires adherence to specific maintenance
protocols to ensure reliable operation and emissions compliance. The timing belt
replacement interval is specified at 180,000 km (112,000 miles) or 10 years for
most applications. The water pump and timing belt tensioner should be replaced
concurrently due to the interference design.
Engine oil and filter changes are recommended at 15,000-20,000 km (9,300-12,500
miles) or 12 months under normal driving conditions, using oil meeting VW 507.00
specification. Valve clearance inspection is not required due to the hydraulic
lash adjuster system. The fuel filter should be replaced at 30,000 km (18,500
mile) intervals, with the water-in-fuel sensor checked at each service.
The diesel particulate filter (DPF) regeneration occurs automatically under
normal driving conditions; extended periods of low-speed urban operation may
require a forced regeneration procedure using diagnostic equipment. The AdBlue
tank requires replenishment at intervals aligned with oil changes, with
consumption averaging 3-5 percent of diesel fuel consumption by volume.
Coolant replacement is specified at 90,000 km (56,000 miles) or 60 months.
Compression pressure should be consistent across all four cylinders, with a
standard value of 2.2-2.5 MPa (319-363 psi) and a minimum service limit of 1.8
MPa (261 psi) with maximum variation between cylinders of 0.2 MPa (29 psi).
Cylinder Head Bolts (Cold), Step 1: 40 Nm (30 lb-ft).
Cylinder Head Bolts (Cold), Step 2: 80 Nm (59 lb-ft) plus 90° angular turn.
Main Bearing Cap Bolts: 50 Nm (37 lb-ft) plus 90° angular turn.
Connecting Rod Cap Bolts: 30 Nm (22 lb-ft) plus 90° angular turn.
Crankshaft Damper Pulley Bolt: 180-200 Nm (133-148 lb-ft).
Camshaft Sprocket Bolts: 60-70 Nm (44-52 lb-ft).
Camshaft Bearing Cap Bolts: 12-15 Nm (9-11 lb-ft).
Valve Cover Bolts: 8-10 Nm (71-89 lb-in).
Intake Manifold Bolts: 20-25 Nm (15-18 lb-ft).
Exhaust Manifold Nuts: 25-30 Nm (18-22 lb-ft).
Turbocharger Mounting Nuts: 35-40 Nm (26-30 lb-ft).
Oil Pan Bolts: 10-12 Nm (7-9 lb-ft).
Water Pump Bolts: 20-25 Nm (15-18 lb-ft).
Flywheel / Drive Plate Bolts: 60-70 Nm (44-52 lb-ft) plus 90° angular turn.
Timing Belt Tensioner Bolt: 25-30 Nm (18-22 lb-ft).
Fuel Injector Clamp Bolts: 15-20 Nm (11-15 lb-ft).
Common Rail Mounting Bolts: 20-25 Nm (15-18 lb-ft).
EGR Valve Mounting Bolts: 20-25 Nm (15-18 lb-ft).
Engine Mount Bracket Bolts: 55-65 Nm (41-48 lb-ft).
The Volkswagen DFGA engine was deployed across a wide
range of Volkswagen Group vehicles built on the MQB platform, serving as a
mid-range diesel powertrain from approximately 2016 onward.
Volkswagen Tiguan (AD1): The second-generation Tiguan compact SUV received the
DFGA as a core diesel option, with the engine mounted transversely in
front-wheel-drive and all-wheel-drive configurations.
Volkswagen Passat (B8): The mid-size sedan and estate utilized the DFGA as the
2.0 TDI 150 PS variant, offered in both front-wheel-drive and all-wheel-drive
configurations.
Volkswagen Arteon: The fastback sedan received the DFGA as the entry-level
diesel powertrain, paired with both manual and dual-clutch automatic
transmissions.
Volkswagen Touran (5T1): The compact multi-purpose vehicle (MPV) utilized the
DFGA as a high-volume diesel option, calibrated for passenger and cargo
applications.
Volkswagen Golf VII: The seventh-generation Golf received the DFGA in certain
markets as the 2.0 TDI 150 PS variant, serving as the performance-oriented
diesel option above the 1.6 TDI.
Audi A3 (8V): The compact premium hatchback and sedan utilized the DFGA as the
2.0 TDI powertrain in front-wheel-drive and all-wheel-drive configurations.
Audi Q2: The subcompact crossover SUV received the DFGA as the 2.0 TDI option,
with the engine mounted transversely.
Audi Q3 (F3B): The second-generation Q3 compact SUV utilized the DFGA as the 2.0
TDI 150 PS powertrain.
Skoda Kodiaq: The mid-size SUV received the DFGA as the 2.0 TDI 150 PS variant,
offered with front-wheel-drive and all-wheel-drive configurations.
Skoda Superb III: The flagship sedan and estate utilized the DFGA as the 2.0 TDI
150 PS diesel option.
Skoda Karoq: The compact SUV received the DFGA as a core diesel powertrain in
European markets.
Seat Leon ST: The estate variant of the Leon received the DFGA as the 2.0 TDI
150 PS option.
Seat Tarraco: The mid-size SUV utilized the DFGA as the 2.0 TDI 150 PS
powertrain, calibrated for passenger and towing applications.
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