The 2018 Toyota Crown is generally reliable with Toyota's proven hybrid and turbo powertrains, but the 2.0L turbo 8AR-FTS engine has documented issues with carbon buildup and timing components, while transmission oil coolers can fail across all variants.
Transmission Oil Cooler Failure
Occasional · high severity
Typical onset: 70,000-110,000 mi
Symptoms: Transmission fluid mixing with coolant creating milky appearance, Transmission slipping or rough shifts, Overheating transmission, Pink or red coolant in expansion tank
Fix: Replace transmission oil cooler and flush both transmission and cooling system. Requires removal of front components for access. 4-6 hours labor depending on accessibility and extent of contamination damage.
Estimated cost: $1,200-2,200
8AR-FTS Turbo Engine Carbon Buildup on Intake Valves
Common · medium severity
Typical onset: 60,000-90,000 mi
Symptoms: Rough idle and misfires, Loss of power especially on acceleration, Check engine light with multiple misfire codes, Increased fuel consumption
Fix: Direct injection engines without port injection suffer carbon buildup. Requires walnut blasting intake valves with manifold removal. 5-7 hours labor for proper cleaning.
Estimated cost: $800-1,400
8AR-FTS Timing Chain Stretch and Guide Wear
Occasional · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Rattling noise on cold start that goes away when warm, Check engine light with timing correlation codes, Rough running, Metallic ticking from front of engine
Fix: Replace timing chain, guides, tensioner, and both VVT gears. Also replace cam phasers if codes present. Front engine work requiring significant disassembly. 10-14 hours labor.
Estimated cost: $2,800-4,500
Hybrid System Inverter Cooling Pump Failure (2.5L and 3.5L Hybrid)
Occasional · high severity
Typical onset: 90,000-140,000 mi
Symptoms: Hybrid system warning light, Reduced power mode, Overheating warnings with no engine temperature issue, Complete shutdown in severe cases
Fix: Replace hybrid inverter coolant pump and flush system. Pump is electric and separate from engine cooling. 3-4 hours labor with proper hybrid system precautions.
Estimated cost: $1,400-2,000
Transmission Mount Failure
Common · low severity
Typical onset: 65,000-100,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Vibration at idle especially with AC on, Excessive engine movement visible from engine bay
Fix: Replace worn transmission mount. Common wear item on this platform due to weight distribution. 2-3 hours labor.
Estimated cost: $350-600
8AR-FTS High Pressure Fuel Pump Failure
Occasional · high severity
Symptoms: Hard starting or no start, Loss of power under load, Fuel pressure codes, Rough running especially when cold
Fix: Replace high pressure fuel pump mounted on engine. Turbo direct injection requires very high fuel pressure. 3-4 hours labor including fuel system depressurization.
Estimated cost: $1,100-1,800
Owner tips
Use Top Tier gasoline and consider periodic fuel system cleaning on 2.0L turbo to minimize carbon buildup
Change transmission fluid every 50,000 miles regardless of 'lifetime fill' claims to prevent oil cooler contamination damage
Monitor for timing chain noise on turbo models during cold starts—early intervention prevents catastrophic engine damage
Hybrid models require dedicated Toyota hybrid coolant for inverter system—never substitute regular coolant
Buy the hybrid variants with confidence for 200k+ miles; approach the 2.0L turbo cautiously and budget for carbon cleaning and potential timing chain work.
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.
Fitment notes: Hybrid auxiliary battery; smaller capacity due to hybrid system; located in trunk
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Every control module on the 2018-2023 Toyota Crown — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Mileage programming required; VIN registration; immobilizer data transfer required
Seat Control ECU / Memory Seat ECU (SEAT ECU)0.8 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under front seats, driver and/or passenger side
🔧 Toyota Techstream or vehicle settings
⚠️ Seat position memory relearn required; user settings lost on replacement
Backup Camera / Multi-Terrain Monitor Camera ECU (CAMERA ECU)0.8 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Behind rear bumper or integrated with camera housing
🔧 Toyota Techstream or vehicle settings
⚠️ Camera calibration and guideline adjustment may be required
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2018 Toyota Crown 2.5L I4 Hybrid A25A-FXS and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.