Audi SQ5

Early CWGD units with P-code GP0 (up to production date 06.08.2018) have poor-quality rocker arm rollers. The small bearing rollers can fall out and end up in the oil sump — camshaft and piston damage possible.

Symptoms: Combustion misfire, engine fault light, rough running, clattering noise from cylinder head.

The EA839 water pump is vacuum-controlled. On internal failure, coolant enters the vacuum system and spreads to further engine components. The old 4-bolt pulley is the prime suspect — identifiable if original pump still fitted.

Symptoms: Coolant warning light, coolant loss without external leakage, P0299 (boost pressure too low), 'drivetrain fault', 12V battery no longer charging.

The belt starter-generator (BSG) and the 48V battery can fail, especially on vehicles before 2021 without the protective cover over the control unit. Diagnosis and calibration required after replacement.

Symptoms: '48V system fault' in display, start-stop disabled, no recuperation, rough or delayed starting, limp mode.

Beyond water pump failure, EA839 engines also show coolant loss from seal failures elsewhere in the cooling system. Regular coolant level checks important.

Symptoms: Coolant level drops without visible leakage, overheating warning, coolant smell in engine bay.

KBA recall: stress corrosion cracking can cause elevated play between the control arm and wheel carrier. Affects build years 2019–2021. Free replacement at dealer.

Recall for Q5 FY (production July 2018 to March 2019): faulty brake master cylinders increase stopping distance. Free replacement programme through Audi.

Salt water penetrates the rear control arm bushings. Stress corrosion can cause the bushings to come loose, resulting in increased steering play and changed handling dynamics.

Fuel rail seals can leak, with fuel escape and fire risk. Affects early FY model years 2017–2018. Recall code 24DP.

Moisture enters through cracks in the inverter housing of the belt-driven starter-generator — short circuit, overheating, fire risk. Recall code 27H2, approximately 530,000 vehicles worldwide.

A manufacturing defect in the front seat adjustment mechanism can impair the restraint function in a collision. Approximately 2,918 Q5/SQ5 vehicles affected worldwide.

The Haldex rear differential suffers from oil contamination by clutch debris when maintenance is neglected. A differential oil change clears the symptoms. Neglect risks differential damage.

Brake callipers seize especially after prolonged standing. Rear axle callipers are most affected. MOT reports list brake defects as a frequent fault.

Pads and discs wear quickly on the SQ5 due to vehicle weight and sport-biased setup. Rear pads are often worn from 40,000 km, fronts by 60,000 km. City driving accelerates the process noticeably.

The upper control arms of the front axle show bushing and joint wear at higher mileages. Typical from 80,000–120,000 km, especially with spirited driving or poor road surfaces.

Air suspension rubber bellows become brittle and porous. Gradual pressure loss causes the car to sink, mainly at the front. The compressor then runs continuously and overheats.

The optional carbon-ceramic brake loses significant braking performance in cold and wet conditions. Loud squealing in winter is well documented. Audi explicitly flags this characteristic.

Water collects in the front body sill sections and causes internal corrosion. Recall action: remove rust, prime, repaint, retrofit plastic covers.

The A/C compressor can fail at higher mileages. Common causes are refrigerant loss through micro-leaks in the condenser (vulnerable to stone chips) or mechanical wear.