The 2019 Peugeot 308 with 1.6L THP engine uses the PSA Group's EAT6 automatic transmission and shares components with Citroën/DS platforms. Main concerns center on the transmission cooling system, engine mount failures, and electrical gremlins in the lighting and fuse box circuits—typical Euro-spec issues that bite hardest after warranty expires.
EAT6 Transmission Oil Cooler Failure
Common · high severityTypical onset: 50,000-90,000 mi
Symptoms: Transmission fluid in coolant reservoir or vice versa (milkshake appearance), Harsh shifting or slipping after engine reaches operating temp, Transmission overheating warning on dashboard, Coolant loss with no external leaks visible
Fix: Replace transmission oil cooler and flush both cooling system and transmission. Often requires new transmission fluid and filter. Sometimes cooler contamination damages transmission internals requiring rebuild. 4-6 hours labor for cooler only, 15-25 hours if rebuild needed.
Estimated cost: $800-1,200 (cooler only), $3,500-5,500 (with transmission rebuild)
Transmission Mount Collapse
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Loud clunk when shifting from Park to Drive or Reverse, Excessive engine movement visible when accelerating hard, Vibration through cabin at idle, especially with AC on, Jerky engagement during takeoff
Fix: Upper transmission mount (pendulum mount) uses hydraulic fluid damping that fails, causing metal-to-metal contact. Replacement requires lifting engine/trans slightly. 2-3 hours labor. OEM mounts last longer than aftermarket.
Estimated cost: $350-650
Engine Bay Fuse Box Water Intrusion
Occasional · high severitySymptoms: Multiple random electrical faults (lights, wipers, windows) especially after rain or car wash, No-start condition with multiple warning lights, Corroded pins visible in fuse box connectors, Intermittent loss of power steering or ABS warnings
Fix: Fuse box seal design flaw allows water entry from hood/windshield area. Requires fuse box replacement and sometimes harness repair for corroded pins. Water damage can affect BSI (body control module). 3-5 hours labor depending on harness damage.
Estimated cost: $800-1,800
LED Headlight Module Failure
Occasional · medium severityTypical onset: 40,000-80,000 mi
Symptoms: One or both headlights completely out (not just bulb), Flickering or dimming headlight output, Headlight failure warning on dash, Moisture visible inside headlight housing
Fix: LED driver module or entire headlight assembly fails, not serviceable separately on most units. Peugeot uses integrated assemblies with expensive electronics. Aftermarket options scarce. 1-2 hours labor per side.
Estimated cost: $600-1,200 per headlight assembly
1.6 THP Timing Chain Stretch
Occasional · high severityTypical onset: 80,000-130,000 mi
Symptoms: Rattling noise from front of engine on cold start, lasting 5-10 seconds, Check engine light with cam/crank correlation codes (P0016, P0017), Rough idle or misfires that come and go, Loss of power under acceleration
Fix: The Prince/THP engine timing chain and tensioner system wears prematurely, especially with extended oil change intervals. Requires timing chain kit, guides, tensioners, and VVT solenoids. Front-wheel-drive layout makes access tight. 10-14 hours labor. Ignore it and you risk valve-to-piston contact.
Estimated cost: $2,200-3,500
Turbocharger Wastegate Rattle
Occasional · low severityTypical onset: 70,000-110,000 mi
Symptoms: Metallic rattling from engine bay at idle, disappears above 1,500 RPM, No performance loss or boost issues, Rattle more pronounced when engine is hot
Fix: Wastegate actuator arm develops play in bushings causing noise but usually doesn't affect function until very worn. Can replace actuator separately or full turbo if shaft play is excessive. 4-6 hours labor for turbo R&R.
Estimated cost: $400-700 (actuator), $1,800-2,800 (turbo replacement)
Decent daily driver if maintained obsessively, but transmission and electrical issues make it a risky used buy without comprehensive warranty—parts availability in North America is also a nightmare.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.