2017 PORSCHE CAYENNE

Typical onset: 60,000-100,000 mi

Symptoms: sudden coolant loss with no visible external leak, white smoke from exhaust, misfires and rough running, coolant in oil (milky dipstick), complete engine failure

Fix: Plastic coolant pipes inside the engine valley crack and dump coolant into cylinders through intake ports, hydraulically locking pistons or washing cylinder walls. Requires full engine rebuild or short block replacement. 25-40 hours labor depending on damage extent. Many shops recommend proactive coolant pipe replacement at 60k-70k mi (6-8 hours labor).

Estimated cost: $12,000-22,000

Typical onset: 50,000-90,000 mi

Symptoms: loud clunk when shifting from park to drive or reverse, excessive vibration at idle in gear, drivetrain movement felt through cabin, visible sagging of transmission

Fix: The large center transmission mount (hydraulic type) fails internally and allows excessive movement. Replacement requires transmission support and partial subframe lowering. 3-4 hours labor. Always inspect both engine and transmission mounts together.

Estimated cost: $800-1,400

Typical onset: 60,000-90,000 mi

Symptoms: rough idle, misfires especially on cold start, loss of power and throttle response, increased fuel consumption, check engine light with misfire codes

Fix: Direct injection engines have no fuel washing over intake valves. Carbon accumulates and restricts airflow. Requires walnut blasting or manual scraping of all intake ports. 8-12 hours labor for proper cleaning with intake manifold removal. Should be done preventively every 60k-70k mi.

Estimated cost: $1,200-2,000

Typical onset: 70,000-120,000 mi

Symptoms: transmission fluid spots under vehicle, burnt transmission fluid smell, transmission overheating warnings, fluid level dropping between services

Fix: Hard lines and connections to the external transmission cooler corrode and develop leaks, especially at fittings. Often requires replacing lines and cooler as assembly. 4-6 hours labor depending on whether radiator support needs to come out.

Estimated cost: $1,500-2,500

Typical onset: 80,000-120,000 mi

Symptoms: hard starting especially when hot, loss of power under acceleration, engine stalling or stumbling, fuel pump noise from tank area, check engine light with fuel pressure codes

Fix: In-tank fuel filter assembly clogs prematurely, often due to fuel quality or tank contamination. Requires fuel tank drop and complete pump/filter module replacement. 5-7 hours labor. Porsche doesn't sell filter separately — entire pump assembly required.

Estimated cost: $1,800-2,800

Typical onset: 70,000-110,000 mi

Symptoms: excessive vibration at idle, clunking from engine bay on startup or shutdown, check engine light with engine mount fault codes, rougher ride quality

Fix: Electronically-controlled hydraulic engine mounts fail internally or lose their active control function. Can replace with OEM active mounts (expensive) or aftermarket solid mounts (cheaper but harsher). 2-3 hours labor per mount.

Estimated cost: $800-1,600

Symptoms: moisture visible inside headlight lens, one headlight dim or not working, flickering headlight, headlight error messages on dash

Fix: Headlight housings develop seal failures allowing moisture in, which then kills expensive ballasts. Subject to NHTSA recall but many still experience issues. Resealing housing (1 hour) or ballast replacement (0.5-1 hour). Complete headlight assembly is $2k+ OEM.

Estimated cost: $400-900