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I've been driving 240s for over 30 years. The list of things that can completely disable one is small. I'd R&R or inspect the following if condition is unknown:
- Radiator, water pump, and all coolant hoses including heater hoses. Check condition of heater control valve (can leak or break), new T-stat, condsider replacing coolant reservoir
- Timing belt, tensioner, and all drive belts
- All fuses and clean connections, including 25 amp blade fuse under hood (if it has this)
- Battery and terminals/cables (seen many no-starts attributed to simple corrosion of terminals). Check condition of starter wire from alternator on a '93 as these can wear through where it rubs against alternator bracket (no start or engine fire can result -- happened to me at 260k on 1993 wagon, near fire and PITA to fix)
- Fuel pump relay
- Fuel filter (maybe -- they seem to last forever. Pumps also go 300k miles plus with no issues)
- Headlight relay. These go bad without warning and poof, no lights
- All PCV system components (can result in oil leak or blow cam plug, causing rapid and messy loss of engine oil -- BTDT)
- Air Mass Meter (usually failure causes extreme driveability issues)
Obviously you want to check the condition of drivetrain, ignition, suspension, steering, brakes, exhaust, etc. to ensure safe operation but complete "stop the car" failure of these components is rare IMO. Even fuel hoses seem to last a long, long time.
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