2016 PORSCHE CAYENNE GTS

Typical onset: 40,000-80,000 mi

Symptoms: Metallic knocking or ticking from engine, especially cold start, Excessive oil consumption (more than 1 quart per 1,000 miles), Low oil pressure warning or fluctuating oil pressure gauge, Metal shavings in oil filter or on drain plug magnet, Check engine light with misfire or timing correlation codes

Fix: Complete engine rebuild or short block replacement required. This involves removing the engine, disassembling to inspect cylinder walls and bearings, replacing pistons, rings, bearings, and sometimes machining cylinders. Figure 40-60 hours labor for a proper rebuild or replacement. Some shops opt for factory reman short blocks to save machine work time.

Estimated cost: $15,000-25,000

Typical onset: 60,000-100,000 mi

Symptoms: Transmission fluid puddles under vehicle, typically pink or red fluid, Burnt transmission fluid smell, Transmission slipping or harsh shifts when hot, Low transmission fluid warning on dashboard

Fix: Replace transmission oil cooler lines and associated seals. The lines run along the undercarriage and corrode or crack at connection points. Requires lift access and draining transmission fluid. About 3-5 hours labor depending on which lines are affected and accessibility.

Estimated cost: $800-1,500

Typical onset: 70,000-120,000 mi

Symptoms: Clunking or banging when shifting from Park to Drive or Reverse, Excessive vibration during acceleration, Visible sagging or torn rubber on mount during inspection, Drivetrain movement felt through cabin during throttle changes

Fix: Replace failed transmission mount(s). The rear mount is most prone to failure on the Cayenne due to weight and torque. Requires supporting the transmission, removing old mount hardware, and installing new mount. About 2-3 hours labor.

Estimated cost: $500-900

Typical onset: 50,000-90,000 mi

Symptoms: Rough idle or engine stumbling under load, Loss of power during acceleration, Extended cranking before engine starts, Check engine light with fuel pressure or lean mixture codes, Engine hesitation or surging at highway speeds

Fix: Replace high-pressure fuel filter located in engine bay. Porsche does not list this as regular maintenance, but contamination or fuel quality issues cause premature clogging. Requires relieving fuel system pressure and proper fuel handling procedures. About 1.5-2 hours labor.

Estimated cost: $400-700

Typical onset: 60,000-100,000 mi

Symptoms: Coolant smell in cabin or under hood, Visible coolant drips or stains on engine or under vehicle, Low coolant warning light, Engine running hotter than normal, Steam from engine bay in severe cases

Fix: Replace plastic coolant pipes and thermostat housing that crack from heat cycling. The V-config engine has coolant pipes in the valley that are notorious for becoming brittle. Requires partial engine disassembly to access, draining coolant, and replacing multiple O-rings and gaskets. About 6-10 hours labor depending on how many pipes need replacement.

Estimated cost: $1,500-3,000

Typical onset: 70,000-110,000 mi

Symptoms: Rattling noise from engine bay at idle or light throttle, Loss of boost pressure and power, Check engine light with turbo underboost or overboost codes, Excessive black smoke from exhaust under acceleration, Turbo whining or squealing noises

Fix: Replace or rebuild turbochargers with failed wastegate actuators or worn bearings. The wastegate linkage becomes loose and rattles, or the turbos develop shaft play. Requires removing turbos, exhaust components, intercooler piping, and associated oil/coolant lines. About 12-16 hours labor for both turbos.

Estimated cost: $4,000-7,000