P1800 / P1800ES

1961-1973 / Coupe / Shooting Brake / Sweden

All P1800 / P1800ES problems All workshop issues

Critical Electrical

Corroded fuse box and blown fuses

Symptoms

Random electrical failures, wipers, indicators, lights, ignition.

Cause

The fuse box corrodes, connections get crusty, fuses blow because circuits are overloaded or shorted.

Fix

Pull the fuse box, clean all contacts with contact cleaner and a wire brush.

Replace dodgy fuses (use the correct rating, not a nail).

Upgrade to a modern blade fuse box if you're rewiring.

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// More P1800 / P1800ES problems

Other known issues

Common Electrical

Lucas-derived wiring faults (early Jensen-built cars)

Intermittent starting, dead instruments, lights that work when they feel like it, random short circuits.

Common Electrical

Voltage regulator and dynamo/alternator faults

Battery won't charge, instruments flicker, lights dim, battery goes flat overnight.

Critical Electrical

Faulty ignition switch

Key won't turn, no crank, intermittent starting, dash lights flicker.

Common Engine

Oil leaks from rear main seal

Oil weeps or pours from the back of the engine, usually visible around the bellhousing. Can soak the clutch on manual cars.

Common Engine

Piston ring wear and oil consumption (B18/B20)

Blue smoke on startup or under load. Engine uses a litre of oil every 500-1000 km. Exhaust tips go black and sooty.

Common Engine

Timing gear wear and rattle (B18)

Rattling or chattering noise from the front of the engine, especially on cold start or at idle. Sometimes a metallic ticking that doesn't go away when warm.

View all 28 P1800 / P1800ES problems