Generations
GEN2 — Gen-2
2004–2013
1.3L Petrol, 1.6L Petrol
Top issues to watch for
The most serious Proton Gen 2 problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Structural corrosion reducing assembly rigidity (GEN2)
The Gen-2's body structure is prone to corrosion that affects the rigidity of the vehicle assembly, particularly around sill areas and suspension mounting points. This represents a direct safety risk as weakened structural points can affect crash protection and suspension geometry. MOT data shows this model fails structural corrosion tests at 9.9 times the fleet average, with failures appearing from 40,000 miles onwards.
What happens if ignoredStructural corrosion compromises crash safety and can cause suspension components to break free from their mountings. The car should not be driven if significant structural damage is present. Repair typically requires professional welding and may exceed the vehicle's value on older examples.
Independent garage
£500–£1,500
Specialist
£600–£1,800
Main dealer
£800–£2,500
Parts only
£100–£400
Major
Brake actuator leakage (GEN2)
The brake actuator unit (part of the ABS system) develops internal leakage that does not immediately affect braking performance but indicates impending failure. This component integrates the ABS pump and valve block in a single unit. MOT data shows this model fails actuator leakage tests at 91.9 times the fleet average, with peak failures occurring between 80,000-100,000 miles.
What happens if ignoredInternal actuator leakage will eventually progress to complete ABS failure and potentially compromised normal braking. The entire actuator unit typically requires replacement as internal seals cannot be serviced separately. Repair costs are high due to the integrated design.
Independent garage
£400–£700
Specialist
£500–£800
Main dealer
£600–£1,000
Parts only
£250–£450
Major
Power steering system leakage or malfunction (GEN2)
The hydraulic power steering system develops leaks from the pump, high-pressure lines, or rack seals, or suffers pump failure. This model shows power steering failures at 52.8 times the fleet average, with peak failures between 40,000-60,000 miles. Complete loss of power assistance makes the car very difficult to steer at low speeds.
What happens if ignoredComplete power steering failure makes the car extremely difficult to control at low speeds and in parking situations. Continued driving with low fluid will destroy the pump. Pump replacement is the most common repair, though rack seal failure also occurs.
Independent garage
£200–£400
Specialist
£250–£500
Main dealer
£350–£650
Parts only
£120–£300
Major
Suspension component damage or corrosion (GEN2)
Suspension components including control arms, subframes, and mounting brackets suffer excessive corrosion damage that compromises their structural integrity. This affects the car across its entire mileage range from 20,000 miles onwards. MOT data shows suspension component damage at 25.6 times the fleet average, indicating a systematic weakness in corrosion protection.
What happens if ignoredSeverely corroded suspension components can fail suddenly, causing loss of control and potential accidents. Damaged components affect wheel alignment, cause premature tyre wear, and compromise handling. Repairs often require multiple components due to widespread corrosion.
Independent garage
£150–£400
Specialist
£200–£500
Main dealer
£300–£700
Parts only
£80–£250
1 more known issues tracked
Including wear items, electrical niggles, and generation-specific problems.
MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Proton Gen 2 fails at a significantly higher rate than the average car.
Coil springs broken
Brakes · 40-60k miles
MOT failure rate: 121x the fleet average
Sample: 914 tests
Power steering fault
Steering · 40-60k miles
MOT failure rate: 53x the fleet average
Sample: 1,179 tests
Anti-roll bar links worn
Suspension · 20-40k miles
MOT failure rate: 43x the fleet average
Sample: 278 tests
Bumper insecure or with damage
Bodywork · 40-60k miles
MOT failure rate: 42x the fleet average
Sample: 618 tests
Parking brake inoperative on one side
Brakes · 20-40k miles
MOT failure rate: 40x the fleet average
Sample: 340 tests
ABS fault
Suspension · 20-40k miles
MOT failure rate: 31x the fleet average
Sample: 167 tests
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Related
Proton Gen 2 reliability FAQs
What are the most common problems with the Proton Gen 2?
The Proton Gen 2 has 5 known issues across 2 severity levels. The most serious are: Structural corrosion reducing assembly rigidity (GEN2).
Is the Proton Gen 2 reliable?
The Proton Gen 2 has 1 dangerous and 4 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix Proton Gen 2 problems?
Repair costs range widely. The most significant issue (Structural corrosion reducing assembly rigidity (GEN2)) costs £500–£1,500 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.