Lincoln Nautilus
The 2.0L EcoBoost I4 in the Nautilus CD539 is derived from the Edge-era EcoBoost-2.0 block with minor output adjustments. The 8F35 transmission shows shift shudder that TSB 25-2154 fixes via PCM reflash in most cases. Coolant loss from hairline block cracks was seen in the MKX predecessor — rare in the CD539 but worth monitoring. Direct injection: check intake valves around 80,000 km.
Relaxed Luxury Everyday with a Four-Cylinder
250 hp is enough for relaxed daily driving and highway cruising. Buyers who don't visit a racetrack won't miss the V6. Transmission shudder typically resolves at the first dealer visit for the TSB update.
Engine Weaknesses 7
Cracks at the block-head interface allow coolant to leak into cylinders 2 or 3. Primarily affects 2016–2019 MKZ with 2.0L EcoBoost. Class action filed against Ford. Short block replacement is often the only lasting fix.
Symptoms: Cylinder 2 or 3 misfire (P0302/P0303), white exhaust smoke, coolant level dropping without external leak, milky oil.
The 2.0L EcoBoost block can develop hairline cracks causing internal or external coolant loss. A known issue in the MKX predecessor; rare in the CD539 but worth monitoring.
Symptoms: Coolant level drops with no external leak, white smoke from exhaust, rising temperature gauge.
The 6F35 torque converter develops shudder during lock-up at high mileage. The 2017 MKZ 2.0L has recall 17S16 for improperly welded converter studs that can cause sudden loss of drive.
Symptoms: Shudder or vibration between 40–65 mph, jerky shifts, hesitation pulling away from a stop.
The 6F35 in the MKC develops torque converter shudder and shift hesitation at high mileage. Fixes range from fluid change to full replacement.
Symptoms: Shudder 40–65 mph, jerky shifts, hesitation pulling away.
The 8F35 automatic in the Nautilus shows the most complaints in the 2019 model year (46 total complaints reported). TSB 25-2154 PCM reflash solves most cases; severe cases need torque converter or transmission replacement.
Symptoms: Noticeable lurch when upshifting through gears 1–3, clunk on downshift.
Direct injection without port spray allows carbon deposits to accumulate on intake valve faces. Walnut blasting every 80,000 km recommended.
Symptoms: Hard cold start, occasional hesitation at low rpm.
Direct injection without port spray promotes carbon deposits on the intake valve faces. Regular cleaning extends smooth operation.
Symptoms: Stumble on cold starts, hesitation at partial throttle.
Vehicle Weaknesses 4
The 2019 Nautilus is the most complained-about model year with 46 total complaints — 18 transmission issues alone. Chimicles law firm filed a class action. TSB 25-2154 PCM reflash and in severe cases torque converter or transmission replacement needed.
The SYNC 3 APIM module can freeze or fail completely. WiFi or USB software update resolves many cases. Out-of-warranty APIM replacement costs up to $2,500. Recall 19C03 addressed blank IPC display.
Body seals under the rear taillights can fail and direct rainwater into the spare tire well and rear footwells. Out-of-warranty repair costs around $2,200.
The panoramic sunroof panel track can come loose, allowing water entry. 2019–2020 models more frequently affected; components were updated for 2021.
