1996 PLYMOUTH NEON

Typical onset: 60,000-120,000 mi

Symptoms: White smoke from exhaust on startup, Coolant loss with no visible leaks, Overheating under load or in traffic, Milky oil on dipstick or oil cap, Rough idle and misfires once coolant enters cylinders

Fix: Head gasket replacement requires cylinder head removal, machining if warped (common), new head bolts, and timing belt while you're in there. Budget 8-10 hours labor. Many shops recommend doing both gaskets even if only one side is leaking because the other will likely follow within 20k miles. If overheating damage occurred, you may need a full head or even short block.

Estimated cost: $1,200-2,200

Typical onset: 80,000-140,000 mi

Symptoms: Slipping between gears, especially 2nd to 3rd, Delayed engagement when shifting into Drive or Reverse, Shuddering or harsh shifts, Transmission overheating (check cooler lines), No movement in any gear (complete failure)

Fix: The 31TH 3-speed auto is notoriously weak. Rebuilds often fail again within 30-50k miles due to design limitations. Many techs recommend a low-mileage used unit or aftermarket remanufactured transmission. Removal and installation runs 6-8 hours. The transmission oil cooler lines also rot out, causing fluid loss and overheating—inspect and replace preventively.

Estimated cost: $1,800-3,200

Symptoms: Intermittent no-start conditions, Random stalling or rough running, Check engine light with multiple random codes, Melted or chafed wiring visible near exhaust manifold, Corroded connectors near battery and fuse box

Fix: Chrysler issued a recall for certain VINs where the harness could contact hot exhaust components, but many non-recalled units suffer similar issues from age and heat exposure. Repair involves replacing damaged sections or the entire underhood harness. Tracing intermittent electrical faults adds diagnostic time. Plan 3-5 hours for harness replacement, more if extensive diagnosis is needed.

Estimated cost: $400-900

Typical onset: 70,000-150,000 mi

Symptoms: No-start with cranks but won't fire, Stalling while driving, usually restarts after cooling, Intermittent stalling in hot weather, Check engine light with P0320 or P0335 codes

Fix: This sensor is located near the flywheel/flexplate and fails frequently due to heat cycling. It's a cheap part ($30-60) but labor is 1.5-2 hours because access requires raising the vehicle and removing the starter or bellhousing inspection cover. Keep a spare in the glovebox if you daily-drive one of these.

Estimated cost: $150-300

Typical onset: 80,000-130,000 mi

Symptoms: Clunking or thumping when shifting into Drive or Reverse, Excessive vibration at idle, Engine rocking visible under acceleration, Shifter vibration in manual transmission models

Fix: The front and rear motor mounts are hydraulic-filled and collapse with age. Inspect all three mounts (front, rear, and right-side torque strut). Replacing all three is common practice since they fail around the same time. Labor runs 2-3 hours for all mounts. Automatic transmission models also need attention to the transmission mount.

Estimated cost: $350-650

Typical onset: 60,000-120,000 mi

Symptoms: Check engine light with P0441, P0455, or P0456 codes, Failed emissions test, Fuel smell around vehicle, Difficulty filling gas tank (premature shutoff at pump)

Fix: The EVAP purge solenoid fails frequently, and the fuel filler neck and EVAP lines are prone to cracking. Diagnosis requires a smoke test to locate leaks. Purge solenoid replacement is 1 hour; filler neck or canister work adds 2-3 hours depending on what's leaking.

Estimated cost: $200-600

Typical onset: 80,000-100,000 mi

Symptoms: Sudden no-start after belt snaps, Bent valves and piston damage (interference engine), Rattling noise from timing cover before failure, Previous overheating increases risk of premature wear

Fix: The 2.0L is an interference engine—if the timing belt snaps, valves contact pistons and you're looking at head removal, valve job, and possible piston replacement. Timing belt service interval is 60k-90k miles depending on conditions. Do the water pump, tensioner, and idler pulleys at the same time. Preventive timing belt job is 3-4 hours; post-failure engine repair is 12-20+ hours.

Estimated cost: $400-700 (preventive); $2,500-4,500 (post-failure)