2002 SATURN SL

Typical onset: 100,000-150,000 mi

Symptoms: Blue smoke on startup or acceleration, Quart-per-week oil consumption or worse, Rod knock or bottom-end noise after prolonged low-oil running, Loss of compression in one or more cylinders

Fix: These 1.9L SOHC engines burn oil through worn piston rings and valve guides. Most owners don't check oil religiously, starve the bearings, and spin a rod bearing or glaze the cylinders. A proper fix is either full rebuild with new rings, pistons, bearings (16-20 hours labor) or a junkyard short block swap (10-14 hours). Head gasket jobs are often done simultaneously if you're already in there. DIY-ers with a hoist can do a junkyard swap for cheap; shops charge full labor.

Estimated cost: $2,200-4,500

Typical onset: 80,000-140,000 mi

Symptoms: Transmission fluid in coolant reservoir (strawberry milkshake appearance), Coolant in transmission pan, Transmission slipping or erratic shifts after contamination, Overheating transmission or engine

Fix: The internal transmission cooler inside the radiator fails, allowing coolant and ATF to mix. Once contaminated, the transmission is often toast within days. Requires new radiator, full transmission flush or replacement, and all cooler lines. If caught early (fluid check at every oil change), you can get away with radiator and flush (4-6 hours). If the trans is damaged, add another 8-12 hours for a rebuild or replacement. This is a known Saturn killer—check your fluids religiously.

Estimated cost: $800-3,200

Typical onset: 70,000-120,000 mi

Symptoms: Hard clunk when shifting from park to drive or reverse, Vibration at idle in gear, Excessive engine/trans movement visible when revving in park, Difficulty engaging gears smoothly

Fix: The hydraulic transmission mount collapses and allows the entire powertrain to rock excessively. This is a 1.5-2 hour job with the right support, but it's a common DIY mistake to replace only the rear mount and ignore the side mount. Replace both or plan to do it again in 20k miles. OEM or quality aftermarket only—cheap mounts fail in under a year.

Estimated cost: $200-400

Typical onset: 80,000-150,000 mi

Symptoms: Hard starting, especially when hot, Stumbling or hesitation under load, Stalling at idle or during acceleration, Check engine light with fuel trim codes

Fix: Saturn didn't make fuel filter changes easy—it's part of the in-tank fuel pump module on many SLs, but some have an inline filter under the car. If inline, it's a 0.5-hour job. If in-tank, you're replacing the entire pump module (2-3 hours, drop the tank). Most owners never change it, and by 100k+ it's restricting flow. If you're already doing a pump, do the filter. If it's inline, change it every 60k regardless of what the manual says.

Estimated cost: $150-450

Typical onset: 90,000-140,000 mi

Symptoms: Coolant seeping or spraying from plastic fittings near thermostat, Overheating after refilling coolant, Visible cracks in plastic elbows or thermostat housing, Low coolant warning with no obvious external leak initially

Fix: The plastic coolant fittings and thermostat housing become brittle and crack, especially if you live anywhere that sees freeze/thaw cycles. The parts are cheap, but if one breaks while driving you can overheat and warp the head. Replace the thermostat housing, both elbows, and the thermostat itself as a kit (1.5-2 hours). Don't reuse old plastic—it'll crack again within months. This is a good DIY job for someone with basic tools.

Estimated cost: $180-350

Typical onset: 80,000-130,000 mi

Symptoms: Random misfires, often worse when hot, No-start or stalling at temperature, Check engine light with misfire or ignition codes, Loss of power, especially under load

Fix: The ignition coil packs and the ICM (mounted under the coils) fail from heat cycling. Symptoms mimic bad plug wires, but on these engines it's usually the coil or module. Testing requires a scan tool and sometimes a known-good part to swap. Replacement is straightforward—two bolts, unplug, swap (1 hour labor). Do plug wires and plugs at the same time if they're original. Don't throw parts at it—diagnose first or you'll waste money on wires you don't need.

Estimated cost: $200-450