VW Bora
Solid 1.6L 16V naturally aspirated in the Golf IV. Low power but robust. Ignition coils and throttle body are typical wear items. Check valve stem seals at high mileage. Replace timing belt by 120,000 km at the latest.
Rev-Happy 16V
The 1.6 16V revs a little more willingly than the MPI and rewards higher revs better. A solid companion in everyday use, though it makes no sporting claims.
Engine Weaknesses 5
On the 1.6 16V, the timing belt tensioner rollers frequently fail prematurely, leading to belt failure and engine damage if ignored. Replace at the latest every 120,000 km or after 5–6 years.
Symptoms: Squealing from the engine bay, engine failure without warning when belt breaks
Individual ignition coils of the AZD fail in series. Multiple coils often fail within a short period. The problem occurred so frequently that VW replaced the parts under goodwill up to 5 years.
Symptoms: Engine running on 3 of 4 cylinders, warning light flashing, severe hesitation, power loss, petrol smell
Valve stem seals wear prematurely and allow oil into the combustion chambers. Typical: blue smoke for 10–20 seconds after cold start, then smoke disappears.
Symptoms: Blue smoke after cold start for 10–20 seconds, oil level drops without visible leak
Excessively thin oil scraper rings lose tension prematurely, oil consumption rises to 0.5–1 L/1,000 km. Crankcase ventilation floods, EGR and catalytic converter soot up secondarily.
Symptoms: Oil level drops without visible smoke, frequent EGR valve failure, oily throttle body, pressure build-up at oil filler cap
Throttle body and EGR valve carbon up through crankcase ventilation and exhaust recirculation. After cleaning, the throttle body must be re-adapted without exception.
Symptoms: Engine dies at idle, poor starting, idle speed fluctuations, hesitation on gear changes, EPC warning light
Vehicle Weaknesses 9
The 02K manual gearbox up to build date 07/2001 has undersized rivets in the differential cage. These shear off, enter the gears, and cause complete economic write-off of the gearbox.
Thermomechanical overload in the ABS control unit can interrupt the earth connection. ABS and ESP drop out. Affects Bora without ASR/ESP, production period around 2002. Software update as remedy.
Sills and wheel arch edges trap moisture and dirt. Rust starts invisibly from the inside and only becomes visible externally when well advanced. Particularly affects neglected examples.
On the Bora 1J, the door lock switch accidentally triggers all electric windows via the comfort opening function when the key is held in the outer handle. Faulty door locks can also prevent the door being opened from the outside.
On the Bora 1J the A/C compressor and magnetic clutch fail at high mileage. Ageing A/C hoses corrode from the inside; refrigerant escapes and the compressor sustains damage through lack of lubrication.
Faulty microswitches in door locks and handles trigger the alarm for no reason or cause interior lighting to behave incorrectly. Inexpensive wear part but difficult to locate.
Suspension springs — particularly at the rear — break at high mileage. Shock absorbers lose damping from 80,000–120,000 km. Anti-roll bar rubbers and wheel bearings are also typical wear points.
The rubber coating on the dashboard, inner door handles, and centre console becomes sticky after 6–10 years and peels off in strips. Only parts replacement permanently eliminates the problem.
Handbrake Bowden cables corrode at the guide sections and seize. Particularly on vehicles that frequently stand outside. Typical problem over 100,000 km.