The 2020 Morgan Plus Four uses a BMW B48 2.0L turbo inline-four and ZF 8-speed automatic — modern running gear in a hand-built traditional chassis. Most issues stem from BMW powertrain quirks rather than Morgan-specific gremlins, but chassis accessibility and bespoke assembly can inflate labor costs.
Transmission Mount Failure and Oil Cooler Leaks
Occasional · medium severityTypical onset: 30,000-60,000 mi
Symptoms: Clunking on gear changes or acceleration, Transmission fluid leak at cooler lines or radiator end-tank junction, Delayed shifts or harsh engagement when fluid is low
Fix: Replace transmission mount (2.5 hrs labor due to tight quarters) and/or oil cooler lines and seals. ZF coolers can weep at crimps; Morgan's packaging makes access from below awkward. Full fluid flush recommended after cooler work (add 1.5 hrs).
Estimated cost: $1,200-2,400
BMW B48 Timing Chain Stretch and Tensioner Wear
Rare · high severityTypical onset: 60,000-100,000 mi
Symptoms: Cold-start rattle for 2-3 seconds, Check engine light with cam correlation codes (P0016, P0017), Loss of power or rough idle at operating temp
Fix: Full timing chain, guides, and tensioner replacement — cylinder head must come off for proper access and inspection (12-16 hrs labor in a Morgan due to bonnet and accessory removal). Head resurfacing often needed if codes were ignored. BMW sourced parts, but Morgan labor rates and complexity drive costs.
Estimated cost: $4,500-7,500
Fuel Filter Clogging and Low-Pressure Pump Issues
Common · low severityTypical onset: 40,000-70,000 mi
Symptoms: Hesitation under heavy throttle or highway merging, Intermittent stumble at part-throttle, P0087 low fuel pressure code
Fix: Replace in-tank fuel filter and screen (tank drop required, 3-4 hrs due to Morgan's body and frame design). Low-pressure pump can also fail; replace both together if mileage is high. Use OEM BMW parts.
Estimated cost: $800-1,400
Headlight Assembly Moisture and Wiring Corrosion
Occasional · low severitySymptoms: Condensation inside headlight lens after rain or wash, Intermittent headlight flicker or DRL dropout, Check engine light for lamp circuit faults
Fix: Headlight assemblies are not fully sealed at factory and Morgan's exposed wiring can corrode at connectors. Replace assemblies (sold as pairs, ~2 hrs labor) and reseal with butyl; inspect and clean all bulb sockets and grounds. Aftermarket LEDs can worsen moisture ingress.
Estimated cost: $1,200-2,000
Engine Bay Fuse Box Corrosion
Occasional · medium severitySymptoms: Random electrical gremlins (wipers, fuel pump, cooling fans), No-start or crank-no-start intermittently, Blown fuses with no obvious short
Fix: Morgan's open engine bay and minimal weather sealing let moisture into the BMW fuse box. Corrosion at terminals causes voltage drop and nuisance faults. Clean and dielectric-grease all contacts; replace fuse box if terminals are burnt (3 hrs labor for box R&R and ECU relearn). Add splash shield or relocate box if tracked or driven in wet climates.
Estimated cost: $400-1,200
Rear Brake Caliper Seizure
Common · medium severityTypical onset: 25,000-50,000 mi
Symptoms: Parking brake warning light intermittent or stuck on, Uneven rear pad wear or dragging sensation, Handbrake lever requires excessive force
Fix: Electric parking brake calipers (BMW sourced) seize due to infrequent use and moisture exposure. Rebuild kits available but labor is 2-3 hrs per side due to Morgan's rear suspension geometry and brake line routing. Replace pads and resurface rotors during rebuild.
Estimated cost: $900-1,600
Buy one if you want a driver's car with modern reliability, but budget $1,500/year for preventive work — Morgan charm meets BMW parts costs and hand-built labor complexity.
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.