2004 DODGE NEON

Typical onset: 80,000-140,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leaks, milky oil on dipstick, overheating under load, rough idle when cold

Fix: Head gasket replacement requires 6-8 hours labor, includes resurfacing head if warped. SOHC engine more prone than DOHC. If neglected, leads to complete engine failure requiring short block or full rebuild. Always pressure-test cooling system and check for combustion gases in coolant on any used purchase.

Estimated cost: $1,200-2,000

Typical onset: 90,000-150,000 mi

Symptoms: transmission fluid pooling under vehicle, pink or red fluid dripping near radiator, harsh shifting or slipping after fluid loss, sudden transmission overheat warning

Fix: Steel cooler lines rust through at crimped connections or where they pass near exhaust. Requires replacement of cooler lines (2-3 hours), often discovered too late after transmission has been starved of fluid. If caught early, $300-500. If transmission damaged from running dry, add $1,500-3,000 for rebuild or replacement.

Estimated cost: $300-3,500

Typical onset: 70,000-120,000 mi

Symptoms: clunking when shifting from park to drive, excessive engine movement visible under hood during acceleration, vibration at idle that smooths out at speed, transmission shifter feels loose or notchy

Fix: Front motor mount and transmission mount tear from normal wear, especially with aggressive driving. Transmission mount is 1.5-2 hours, front mount is 2-3 hours due to access. Replace both simultaneously to avoid repeat labor. Hydraulic mounts preferred over solid rubber replacements.

Estimated cost: $400-700

Symptoms: intermittent headlight operation, one headlight dims or flickers, bulbs burn out frequently on one side, melted headlight connector

Fix: Poor socket design allows moisture intrusion, corroding terminals and causing high resistance. Bulb heat melts connector. Fix requires replacement of headlight pigtail connector (0.5 hours per side) and applying dielectric grease. NHTSA recalls addressed some batches but problem persists. Check both sides even if only one fails.

Estimated cost: $80-150

Typical onset: 90,000-110,000 mi

Symptoms: squealing from front of engine, sudden no-start with cranking, bent valves and catastrophic damage if belt fails

Fix: DOHC 2.0L is an interference engine - belt failure destroys valves and pistons. Timing belt, water pump, tensioner, and seals are 4-5 hours labor. Neglecting this service results in $2,500-4,500 engine rebuild. SOHC uses timing chain, less critical but tensioner can fail.

Estimated cost: $600-900

Typical onset: 100,000-140,000 mi

Symptoms: hard starting after sitting, stumbling or hesitation during acceleration, stalling at idle after extended highway driving, lack of power uphill

Fix: Fuel filter integrated with pump assembly in tank. Clogging from sediment causes fuel starvation. Replacement requires dropping tank (2-3 hours). Many techs recommend replacing entire pump assembly rather than just strainer. Running tank below quarter-full accelerates pump wear.

Estimated cost: $400-700

Typical onset: 80,000-130,000 mi

Symptoms: random stalling while driving, no-start with good crank but no spark, intermittent dying at stops that restarts after cooling, check engine light with P0320 code

Fix: Sensor fails from heat cycling, located near flywheel. Replacement is 1-1.5 hours but diagnosis can be tricky as failure is often intermittent. Always keep spare in glovebox for these vehicles. OEM sensor strongly recommended over aftermarket.

Estimated cost: $150-300