1997 CHRYSLER LHS

Typical onset: 80,000-140,000 mi

Symptoms: Check engine light with low oil pressure codes, Valve train noise/ticking that worsens when hot, Oil consumption over 1 qt per 1,000 miles, Eventually: complete loss of oil pressure and seized engine

Fix: The 3.5L is notorious for sludge buildup in the oil return passages and crankcase, starving bearings and cams. Once severe, you're looking at short block replacement (12-16 hours) or used engine swap (10-14 hours). Prevention requires religious 3,000-mile synthetic oil changes, but many used examples are already damaged.

Estimated cost: $3,500-6,500

Typical onset: 90,000-150,000 mi

Symptoms: Pink milkshake in coolant overflow (ATF in coolant), Transmission slipping or delayed engagement after cooler failure, Overheating transmission, Coolant loss without visible external leaks

Fix: The transmission cooler inside the radiator corrodes and ruptures, mixing ATF and coolant—destroying both the transmission and potentially the engine. Requires radiator replacement (2-3 hours), full transmission flush or rebuild (6-12 hours if contaminated), and cooling system flush. Many owners don't catch it until the transmission is toast.

Estimated cost: $2,000-5,000

Typical onset: 70,000-120,000 mi

Symptoms: Heavy clunk when shifting from Park to Drive or Reverse, Vibration at idle in Drive, Visible transmission sag when inspected from below, CV axle or exhaust contact during acceleration

Fix: The front and rear transmission mounts fail, letting the heavy transaxle drop and stress other components. Front mount replacement requires supporting the engine and trans (2.5-3.5 hours for both mounts). Delaying this accelerates CV joint and subframe wear.

Estimated cost: $400-700

Typical onset: 100,000-180,000 mi

Symptoms: Harsh or erratic shifting, Transmission stuck in second gear (limp mode), Speedometer erratic or inoperative, Check engine light with speed sensor codes

Fix: The governor pressure solenoid and output speed sensor on the 42LE fail due to heat and fluid contamination. Accessible from underneath without full trans removal (2-3 hours), but requires pan drop and fluid replacement. Solenoid packs run $150-300.

Estimated cost: $400-650

Typical onset: 80,000-150,000 mi

Symptoms: Oil seeping around the intake plenum and valve covers, Burning oil smell after hot shutdowns, Oil pooling on top of the transmission bellhousing, Slow oil consumption without visible drips underneath

Fix: The upper intake plenum gaskets deteriorate and leak oil externally. Not a safety issue but messy. Replacement requires removing the plenum (3-4 hours). Often done in conjunction with valve cover gaskets.

Estimated cost: $500-800

Typical onset: 60,000-120,000 mi

Symptoms: Check engine light with EVAP system codes (P0441, P0455, P0456), Rough idle occasionally after refueling, Fuel smell near charcoal canister area

Fix: The EVAP purge solenoid and leak detection pump (LDP) commonly fail on these Chryslers, triggering emissions codes. Parts are cheap ($50-150), labor is straightforward (1-1.5 hours). Won't strand you but will cause inspection failures.

Estimated cost: $200-350