940 / 960

1990-1998 / Sedan / Estate / Sweden

All 940 / 960 problems All workshop issues

Common Electrical

Alternator and battery failures

Symptoms

Battery light on, dimming lights, or the car won't start. Alternator whine through the radio speakers.

Cause

Alternators wear out, brushes and bearings fail. Batteries last 4-6 years in these cars before capacity drops. Poor earth connections accelerate problems.

Fix

Test charging voltage at the battery, should be 13.8-14.4V with engine running.

If low, suspect the alternator or voltage regulator.

Rebuild kits are available, or fit a remanufactured Bosch unit.

Replace the battery if it's more than 5 years old.

Clean all earth straps, especially the one from engine to chassis and battery to body.

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// More 940 / 960 problems

Other known issues

Critical Electrical

Wiring harness degradation

Intermittent faults, indicators that don't cancel, instruments that flicker, central locking that plays up, or random warning lights. On very high-mileage cars, engine harness insulation cracks and wires short.

Minor Electrical

Central locking and window motor failures

Doors won't lock or unlock remotely, or windows move slowly or not at all.

Critical Engine

Oil leaks everywhere

You'll find oil pooling under the car, dripping from the valve cover, front and rear main seals, cam seals, or oil cooler lines. The B230 engines (940) and B6304 (960) both weep oil as they age, it's not if, it's when.

Common Engine

Flame trap and PCV system clogged

Engine bogs down, idles rough, struggles to rev, or won't start when hot. You might get excessive crankcase pressure, blowing out seals and pushing oil into the intake.

Critical Engine

Rough idle, hesitation, or won't start (fuel system issues)

Stumbling acceleration, poor fuel economy, hard starting, or stalling. Sometimes it runs fine cold but misfires when warm. Check engine light may be on or flashing.

Critical Engine

Timing belt and waterpump failures

Catastrophic engine damage if the belt snaps. You'll hear grinding, the engine stops instantly, and you're looking at bent valves or worse. Waterpump failure shows as overheating or coolant leaks from the front of the engine.

View all 24 940 / 960 problems