Audi Cabriolet B3

First TDI with VP37 injection pump and 66 kW. Economical and durable, but injection pump wears. Check crankshaft bolt. Glow plugs critical in winter.

• !! VP37 injection pump worn from 180,000 km

  Quantity adjuster wears mechanically. Strong juddering at low RPM.

  Symptoms: Juddering and soot clouds below 2,000 rpm, uneven idle
  500–1,500 $
• !! Crankshaft bolt loosening

  Crankshaft gear bolt can loosen. Severe engine damage possible.

  Symptoms: Rattling noise from engine, irregular running, sudden shutdown
  100–3,000 $
• !! TDI turbocharger worn from 160,000 km

  Turbo lasts 150,000-180,000 km. Increased shaft play with neglected oil changes.

  Symptoms: Whistling noise, power loss, blue smoke
  400–1,200 $

+ 1 more engine weaknesses + vehicle weaknesses

1.8L 20V with timing chain instead of belt. 92 kW is sufficient in the Cabriolet. Check chain tensioner, otherwise an uncomplicated engine.

• !! Chain tensioner failure from 150,000 km

  Chain tensioner and camshaft adjuster get noisy from 150,000 km.

  Symptoms: Rattle on cold start, diesel-like knocking noise
  400–1,000 $

Evolution of ABT to 85 kW. Interference engine — belt failure means engine damage. Fundamentally solid, but timing belt and valve stem seals must be checked.

• !! Timing belt failure with engine damage from 120,000 km

  Timing belt must be changed every 120,000 km. Belt failure causes immediate engine damage (interference engine).

  Symptoms: No warning — belt failure causes immediate engine shutdown with valve damage
  450–800 $
• !! Head gasket leaking from 200,000 km

  Head gasket weeps from around 200,000 km. Complete failure causes overheating and engine damage.

  Symptoms: Coolant loss, dark coolant, oil film in expansion tank
  600–1,500 $
• !! Exhaust manifold cracking from 100,000 km

  Exhaust manifold cracks from thermal stress — design weakness on all B4 four-cylinders.

  Symptoms: Metallic ticking on cold start, exhaust smell in engine bay, increased consumption
  200–600 $

+ 1 more engine weaknesses + vehicle weaknesses

5-cylinder naturally aspirated with characteristic sound and 98 kW. KE-III-Jetronic is dated but manageable with mechanical knowledge. Cult engine in the Audi scene.

• !! KE-III-Jetronic injection issues from 120,000 km

  Hot start problems and rough idle from faulty temperature sensor. False air from porous intake hoses.

  Symptoms: Engine stutters when warm, idle fluctuations, no throttle response
  200–800 $
• !! Fuel pump failure from 130,000 km

  Underfloor-mounted fuel pump gets noisy before failing. Complete failure causes breakdown.

  Symptoms: Humming noise from rear, engine misfires, sudden stall
  150–400 $

Early V6 with 110 kW and smooth running. Robust, but high fuel consumption. Change timing belt and water pump regularly. Oil leaks at valve covers are common.

• !! Head Gasket Failure from 180,000 km

  Design-related problem: intake manifold bolts sit at 45° to the sealing face and push the cylinder heads apart laterally. This reduces clamping force in the oil passage area. Old soft gaskets often fail between 150,000–270,000 km.

  Symptoms: White exhaust smoke, internal oil loss at cylinder heads, water in combustion chamber, coolant with brownish emulsion
  800–2,300 $
  Ad cylinder head gasket 2.6 V6 AAHcylinder head gasket AAH077103383D
• !! Water Pump and Timing Belt from 120,000 km

  Timing belt replacement is a mandatory service interval; the water pump should always be replaced at the same time. If the pump fails and the engine overheats, head gasket failure follows quickly. Coolant should be fully renewed with the timing belt change.

  Symptoms: Coolant loss, temperature rising on dashboard, steam from engine bay
  500–1,200 $
  Ad timing belt kit 2.6 V6 AAHwater pump AAH078109119M
• !! Head Gasket Leak from 180,000 km

  The cylinder head gaskets on the AAH 2.8 V6 are a known weakness. They can fail between 150,000–300,000 km. Older soft gaskets deteriorate over time. Often visible as oil marks in the V-area.

  Symptoms: Oil loss in the V-area of the engine, elevated coolant consumption, tendency to overheat, white exhaust with severe failure.
  800–2,000 $
  Ad cylinder head gasket AAH 2.8 V6head gasket A6 C4 2.8

+ 5 more engine weaknesses + vehicle weaknesses

V6 naturally aspirated with 110 kW and refined running. Head gasket problems are the known Achilles heel. Repair can exceed residual value. Maintain cooling system regularly.

• !! V6 head gasket failure from 220,000 km

  Soft head gasket lasts 200,000-280,000 km. Repair at 1,700 EUR often exceeds residual value.

  Symptoms: Coolant loss, exhaust bubbles in expansion tank, heater fails
  1,200–3,000 $
• !! Cooling system problems from 150,000 km

  Radiator clogs, water pump impeller detaches, thermostat sticks. Overheating in city traffic.

  Symptoms: Temperature rises in city traffic, heater goes cold, engine runs hot
  300–900 $
• ! V6 manifold crack from 150,000 km

  Exhaust manifolds crack from thermal stress. Studs break during removal.

  Symptoms: Ticking sound on cold engine, exhaust smell, increased consumption
  300–800 $