VW Touareg
The 4.0 V8 TDI (310 kW) in the Touareg III is one of the last large-displacement diesel V8s. It is considered very reliable; existing owners report virtually no problems up to 130,000 km. Low production numbers and high vehicle prices make it a niche product.
V8 TDI — Porsche Level
422 hp and 900 Nm, 0–100 in 4.9 seconds — that's Porsche Cayenne under a VW badge.
Engine Weaknesses 5
Defective injectors in the 4.0 V8 TDI can cause piston damage. A cylinder 3 piston was destroyed by a faulty injector. Repair requires engine removal at considerable cost.
Symptoms: Heavy smoke, loss of power, engine noise, engine failure
The 4.0 V8 TDI shows coolant loss from hairline cracks in the cylinder head. Coolant can enter the engine block and accumulate there.
Symptoms: Coolant level drops without visible leak, white exhaust plume, coolant in the engine oil
Some owners report minimal coolant loss without an identifiable cause. While non-critical in small quantities, the coolant level should be checked regularly.
Symptoms: Coolant level drops slowly, no warning light, no visible leak
The 4.0 V8 TDI with its large displacement and soot output is susceptible to DPF clogging in predominantly short-trip use, as regeneration temperature is not reached sufficiently.
Symptoms: DPF warning light, reduced power, limp mode, increased fuel consumption
The Touareg III has very complex vehicle electronics that cause high diagnostic and repair costs when faults occur intermittently. The heavy networking makes fault-finding difficult in independent workshops.
Symptoms: Intermittent warning lights, occasional failures of driver assistance systems, software errors
Vehicle Weaknesses 14
The 40A switching relay for the air suspension compressor gums up after 3–4 years. Vehicle sinks overnight, especially at the front. Compressor replacement including diagnostics: 400–1,500 €; air bag failures additional up to 2,000 €.
Defective spindle drive in the electric tailgate: a pre-loaded spring can detach and injure people. Affects vehicles with servo closing (4E7) or virtual pedal (5i6) from production January 2019. 2,100 units worldwide.
Brake discs on V6 models are prone to heavy corrosion and pitting. Replacement sometimes necessary after only 17,000–21,000 km. OEM discs cost approx. 470 € each; cheaper alternatives from 65 €. The large 400 mm front discs are particularly affected.
The infotainment system fails to start correctly after software updates or freezes up. Navigation destinations are periodically deleted. Control unit replacement required if software reset doesn't help. Particularly affects model year 2019–2021.
If the differentials and transfer case are not serviced with fresh oil every 60,000 km, bearing noise and banging from the rear differential develop. Incorrect differential oil generates rumbling when turning.
On the Touareg CR, the rubber hoses of the refrigerant lines become porous — particularly the hose at the rear left of the wheel arch on four-zone air conditioning systems. Refrigerant loss leads to total failure. OEM part costs approx. 420 €.
On the Touareg CR, hydraulic power steering assistance sporadically fails when manoeuvring slowly at full lock. Contaminated or aged hydraulic fluid is the most common cause.
The Innovision Cockpit in the Touareg CR loses saved user data after a restart. The infotainment sporadically fails to start or stays on a black screen. Software updates via the dealer are often the only solution.
On the Touareg CR, the Innovision central display fails or shows a black screen. The control unit is defective and must be replaced. VW has acknowledged the problem; waiting times for updates can exceed a year.
On the Touareg CR with electric towbar, the adjustment motor fails: the coupling extends but can no longer retract. Repair often only possible by complete replacement; cost up to 2,000 €.
The IQ.Light Matrix LED system on the Touareg CR dazzles oncoming traffic due to incorrect calibration. Camera and headlights must be electronically synchronised; often not correctly set even from the factory.
Rumbling noises occur at the rear axle on the right over rough road surfaces. Worn damper mounts or anti-roll bar bushings are the cause. Diagnosis is difficult as the noise sometimes persists after damper replacement.
Screws on the tailgate gas dampers and underbody fixings show noticeable corrosion after 3–4 years. Corrosion protection on the screws is described as poor by owners. Visually off-putting; rarely structurally critical.
The reversing camera and Area View system sporadically show no image or freeze. Often fixable by software update, but sometimes a hardware defect. The IQ.Light adaptive headlight system incorrectly regulates the beam range.