Alfa Romeo Giulietta 940
Weaknesses, engine ratings and buying advice
240 PS
1.75 TBi · Benzin
Giulietta 1.75 TBi — the Discreet Sports Car
Fun to Drive!105–120 PS
1.6L JTDm Diesel
6 weaknesses
Stay Away!Engine Overview
The Alfa Romeo Giulietta 940 is available with 8 engine variants — from 105 to 241 hp.
The 1.6-litre JTDM from Fiat/Multijet is the volume diesel for the MiTo and Giulietta — 105–120 hp, frugal (4.5–5.5 l/100 km), sufficiently torquey for daily use. Well matched to the MiTo, slightly undersized in the heavier Giulietta. Common rail diesel technology with the usual concerns: DPF regeneration on short-trip use, injector wear at high mileage.
- !! M32 gearbox bearing failure — 5th/6th gear from 80,000 km
Based on 50 reports: gearbox bearings failing partially at 80,000 km. M32 also used for diesel MiTo without reinforcement. Humming noises and total failure if repair is delayed.
Symptoms: Humming in 5th/6th gear, gear lever wanders under load, shift precision deteriorates. - !! Turbo failure from oil starvation from 90,000 km
From fiches-auto.fr: documented turbocharger failures, including turbo failure at 90,000 km. Head gasket damage as collateral damage is possible.
Symptoms: Sudden power loss, whistling sound, blue exhaust smoke, oil in the intake line. - !! UniAir solenoid blockage from 100,000 km
Deposits from unsuitable or old oil can block the UniAir unit solenoid. If blocked in the closed position, the intake valve no longer opens; the affected cylinder does not fire.
Symptoms: Misfire on individual cylinders, three-cylinder running, engine warning light with solenoid fault code
+ 3 more engine weaknesses + vehicle weaknesses
The 2.0-litre JTDM is the most powerful diesel in the Giulietta — 150–175 hp with up to 350 Nm of torque, which moves the front-wheel-drive Giulietta with authority. Multijet II injection for refined running, AdBlue SCR catalytic converter in later versions. DPF regeneration with predominantly short-trip use is the main concern.
- !! UniAir actuator blockage from 100,000 km
The MultiAir unit solenoid blocks from deposits caused by old or wrong oil (fault code: actuator blocked). An engine flush can sometimes free the unit; often the entire MultiAir unit must be replaced.
Symptoms: Three-cylinder running, permanent engine warning light, power drop, rough acceleration - !! Intake manifold coked by EGR from 120,000 km
The 2.0 JTDM in the Giulietta tends to have the intake manifold coked by the EGR system, particularly with short-trip driving.
Symptoms: Power loss, black smoke, swirl flap risk, limp mode - !! DPF blockage with short-trip driving from 100,000 km
DPF clogs with predominantly urban driving. Regular motorway runs are required for regeneration.
Symptoms: Engine warning light, power loss, elevated fuel consumption
+ 3 more engine weaknesses + vehicle weaknesses
The 1.4-litre MultiAir turbo is Alfa's technical masterpiece in the small car segment: electrohydraulic valve timing without a throttle plate, variable valve lift control, up to 170 hp. The MultiAir technology significantly improves throttle response and efficiency over the conventional 1.4 T-Jet. However, the technology is also more complex and more susceptible to repair: the MultiAir unit is a specific wear item, and oil changes every 10,000 km are mandatory for the hydraulic unit.
- !! MultiAir unit blocked / failed from 50,000 km
The hydraulic-electromagnetic MultiAir unit clogs when oil change intervals are too long or the wrong oil is used. Fault codes P1062/P1063. If ignored, a cascade failure up to a seized piston can result (8,000–10,000 €). Post-2013 (MultiAir II) is less frequently affected.
Symptoms: Engine running on 3 cylinders, flashing engine warning light, rough idle, start-stop system fails, power loss. - !! Timing belt: short replacement interval from 120,000 km
The 1.4 MultiAir timing belt must be replaced every 120,000 km or 8 years, under severe conditions after 4 years. A broken belt causes total engine destruction. The water pump is changed at the same time.
Symptoms: None until breakage. Preventive replacement is strongly recommended. Verify replacement history before purchase. - !! MultiAir Unit Failure from 45,000 km
The electro-hydraulic MultiAir valve timing unit can fail prematurely and deactivates the affected cylinders. The first generation (up to model year 2013) is significantly more failure-prone. Replacement is only possible as a complete unit swap.
Symptoms: Engine warning light P1320, misfires, one cylinder drops out, engine feels like a tractor, power reduction of approx. 25%.
+ 5 more engine weaknesses + vehicle weaknesses
The 1.4-litre MultiAir turbo is Alfa's technical masterpiece in the small car segment: electrohydraulic valve timing without a throttle plate, variable valve lift control, up to 170 hp. The MultiAir technology significantly improves throttle response and efficiency over the conventional 1.4 T-Jet. However, the technology is also more complex and more susceptible to repair: the MultiAir unit is a specific wear item, and oil changes every 10,000 km are mandatory for the hydraulic unit.
- !! MultiAir unit blocked / failed from 50,000 km
The hydraulic-electromagnetic MultiAir unit clogs when oil change intervals are too long or the wrong oil is used. Fault codes P1062/P1063. If ignored, a cascade failure up to a seized piston can result (8,000–10,000 €). Post-2013 (MultiAir II) is less frequently affected.
Symptoms: Engine running on 3 cylinders, flashing engine warning light, rough idle, start-stop system fails, power loss. - !! Timing belt: short replacement interval from 120,000 km
The 1.4 MultiAir timing belt must be replaced every 120,000 km or 8 years, under severe conditions after 4 years. A broken belt causes total engine destruction. The water pump is changed at the same time.
Symptoms: None until breakage. Preventive replacement is strongly recommended. Verify replacement history before purchase. - !! MultiAir Unit Failure from 45,000 km
The electro-hydraulic MultiAir valve timing unit can fail prematurely and deactivates the affected cylinders. The first generation (up to model year 2013) is significantly more failure-prone. Replacement is only possible as a complete unit swap.
Symptoms: Engine warning light P1320, misfires, one cylinder drops out, engine feels like a tractor, power reduction of approx. 25%.
+ 5 more engine weaknesses + vehicle weaknesses
The 1.4-litre T-Jet is the more conventional turbocharged four-cylinder — no MultiAir valve timing, but simpler and more robust. 120 hp in the MiTo, 120 hp in the Giulietta. Frugal, reliable with regular maintenance, without the complexity of the MultiAir technology. The more straightforward choice for everyday drivers.
- !! Turbocharger failure / boost pressure loss from 100,000 km
Turbocharger failure from insufficient lubrication or a failed wastegate actuator. Boost pressure loss occurs without warning, commonly from 80,000–120,000 km with irregular oil changes.
Symptoms: Sudden power loss, car barely accelerates, no noticeable boost pressure, fault code P0240. - !! MultiAir solenoid actuator blocked from 100,000 km
The electro-hydraulic solenoid in the UniAir/MultiAir unit can block from oil residues (fault code: cylinder X UniAir actuator solenoid blocked). An engine flush with oil change can delay the need for replacement; ultimately the entire unit often needs replacing.
Symptoms: Rough running on individual cylinders, engine warning light, brief self-healing after restart - !! Oil consumption from valve stem seals from 110,000 km
Valve stem seals and turbo bearings wear from around 100,000 km. Oil consumption up to 1 L/1,000 km in worst cases. Short-trip driving accelerates wear.
Symptoms: Blue exhaust plume after coasting downhill, low oil level between service intervals, oil mist in the intake tract.
+ 3 more engine weaknesses + vehicle weaknesses
The 150 hp version of the MultiAir turbo — detuned compared to the 170 hp variant through more conservative boost calibration. Positioned as the base turbocharged petrol in the Giulietta. Same MultiAir technology, same service requirements, less power.
- !! MultiAir unit blocked / failed from 50,000 km
The hydraulic-electromagnetic MultiAir unit clogs when oil change intervals are too long or the wrong oil is used. Fault codes P1062/P1063. If ignored, a cascade failure up to a seized piston can result (8,000–10,000 €). Post-2013 (MultiAir II) is less frequently affected.
Symptoms: Engine running on 3 cylinders, flashing engine warning light, rough idle, start-stop system fails, power loss. - !! Timing belt: short replacement interval from 120,000 km
The 1.4 MultiAir timing belt must be replaced every 120,000 km or 8 years, under severe conditions after 4 years. A broken belt causes total engine destruction. The water pump is changed at the same time.
Symptoms: None until breakage. Preventive replacement is strongly recommended. Verify replacement history before purchase. - !! MultiAir micro-filter blocked from 40,000 km
The MultiAir unit micro-filter (55238665) must be cleaned or replaced at every oil change. A blocked filter causes oil pressure loss in the unit and cylinder drop-out.
Symptoms: Fault codes P1062/P1063, rough engine running, cylinder drops out intermittently. Symptoms temporarily disappear after engine flush.
+ 4 more engine weaknesses + vehicle weaknesses
The 1750 TBi with cast iron block — 235 hp in the QV version, 200 hp in the base variant. Turbocharged four-cylinder with high specific output (134 hp/litre in the QV) that builds strong boost from 2,000 rpm. Not to be confused with the 960A1.000 in the 4C, which has a lighter aluminium block. The cast iron block is heavier but thermally more stable and longer-lived — a reliable engine with consistent maintenance. Turbo throttle response in Sport mode (DNA system) noticeably more aggressive than in Normal. Sound is surprisingly characterful for a turbocharged four, especially with a sports exhaust. MultiAir valve timing enables variable valve lift without a throttle plate.
- !! Turbocharger vulnerable under high-performance use from 100,000 km
The 1.75 TBi (235 hp) in the Giulietta QV is under high load. Turbo damage with aggressive driving and insufficient oil cool-down after hard use is documented.
Symptoms: Turbo whistling, power loss, blue smoke when accelerating - !! Injectors and intake valves fouled from 100,000 km
Direct injection on the 1.75 TBi leads to deposits on intake valves and injectors, particularly with short-trip driving.
Symptoms: Rough engine running, power loss, misfires - !! MultiAir micro-filter blockage from 60,000 km
The MultiAir oil micro-filter behind the timing belt cover must be checked at every oil change service. If overlooked, oil pressure drops in the MultiAir unit, causing misfires and cylinder drop-out.
Symptoms: Engine running on 3 cylinders, three-cylinder running on cold start, oily smell, engine warning light
+ 5 more engine weaknesses + vehicle weaknesses
The 1750 TBi with cast iron block — 235 hp in the QV version, 200 hp in the base variant. Turbocharged four-cylinder with high specific output (134 hp/litre in the QV) that builds strong boost from 2,000 rpm. Not to be confused with the 960A1.000 in the 4C, which has a lighter aluminium block. The cast iron block is heavier but thermally more stable and longer-lived — a reliable engine with consistent maintenance. Turbo throttle response in Sport mode (DNA system) noticeably more aggressive than in Normal. Sound is surprisingly characterful for a turbocharged four, especially with a sports exhaust. MultiAir valve timing enables variable valve lift without a throttle plate.
- !! Turbocharger vulnerable under high-performance use from 100,000 km
The 1.75 TBi (235 hp) in the Giulietta QV is under high load. Turbo damage with aggressive driving and insufficient oil cool-down after hard use is documented.
Symptoms: Turbo whistling, power loss, blue smoke when accelerating - !! Injectors and intake valves fouled from 100,000 km
Direct injection on the 1.75 TBi leads to deposits on intake valves and injectors, particularly with short-trip driving.
Symptoms: Rough engine running, power loss, misfires - !! MultiAir micro-filter blockage from 60,000 km
The MultiAir oil micro-filter behind the timing belt cover must be checked at every oil change service. If overlooked, oil pressure drops in the MultiAir unit, causing misfires and cylinder drop-out.
Symptoms: Engine running on 3 cylinders, three-cylinder running on cold start, oily smell, engine warning light
+ 5 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| TCT dual-clutch slipping The TCT dual-clutch on the Giulietta slips from around 70,000–100,000 km, particularly on the 175 hp diesel variant. The manufacturer regards the clutch as a wear item — no goodwill replacements. Clutch kit approximately 980 €, total cost with fitment approximately 2,400 €. Symptoms: Revs rising without drive, slipping in 3rd and 5th gear, jerky pull-away from 80,000 km | High |
Test Reports
TÜV Report 2017
In the TÜV report the Giulietta scores above average for four- to five-year-old vehicles — a clear quality leap over predecessors the 147 and 33. Weak points are the foot brake and incorrectly adjusted headlights. At the second MOT the Giulietta fails the emissions test twice as often as the average.
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Known Problems and Issues +
A total of 49 weaknesses have been documented for the Alfa Romeo Giulietta 940 (2010–2020) — 41 engine-related and 8 vehicle-related. One problem engine: 940A3000 (1.6L JTDm). Typical issues affect Gearbox, Suspension, Electronics, Interior.
Giulietta (940A3000, 2010–2020) — Stay Away!: M32 gearbox bearing failure — 5th/6th gear, Turbo failure from oil starvation, UniAir solenoid blockage. Power: 105 PS.
Giulietta (940A3000, 2010–2020) — Stay Away!: M32 gearbox bearing failure — 5th/6th gear, Turbo failure from oil starvation, UniAir solenoid blockage. Power: 114–120 PS.
Giulietta (940A4000, 2010–2020) — Be Careful: UniAir actuator blockage, Intake manifold coked by EGR, DPF blockage with short-trip driving. Power: 150 PS.
Giulietta (940A4000, 2010–2020) — Be Careful: UniAir actuator blockage, Intake manifold coked by EGR, DPF blockage with short-trip driving. Power: 163–175 PS.
Giulietta (940A4000, 2016–2020) — Be Careful: UniAir actuator blockage, Intake manifold coked by EGR, DPF blockage with short-trip driving. Power: 170–175 PS.
Giulietta (940A2000, 2010–2020) — Be Careful: MultiAir unit blocked / failed, Timing belt: short replacement interval, MultiAir Unit Failure. Power: 163–170 PS.
Giulietta (940B7000, 2010–2020) — Be Careful: Turbocharger failure / boost pressure loss, MultiAir solenoid actuator blocked, Oil consumption from valve stem seals. Power: 116–120 PS.
Giulietta (940A1000, 2010–2020) — Be Careful: Turbocharger vulnerable under high-performance use, Injectors and intake valves fouled, MultiAir micro-filter blockage. Power: 235–241 PS.
Giulietta (940C2000, 2015–2018) — Be Careful: MultiAir unit blocked / failed, Timing belt: short replacement interval, MultiAir micro-filter blocked. Power: 150 PS.
What to watch out for with the Alfa Romeo Giulietta? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
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Last updated: February 2026 · All information without guarantee