According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1998 Saturn S-Series has 3 documented known issues. No issues are rated critical, indicating generally reliable ownership. Across all issues with published estimates, repair costs range from $20 to $450. DIY maintenance guides at au7o.io.
On the 1991-1999 Saturn S-Series, the Saturn S-Series uses a Distributorless Ignition System (DIS) with a waste-spark coil pack mounted on top of the engine. The coils and the Ignition Control Module (ICM) fail with age, throwing P0300-series misfire codes (commonly P0301 or P0302). A subtle but documented contributor is poor grounding: the ICM grounds to the transmission bellhousing via a stud, and corrosion on this ground path causes intermittent misfires that are easily misdiagnosed as coil failure. The waste-spark design uses the #4 plug firing on the compression stroke to fake a cam signal, so if the #4 coil weakens, the DIS may also lose its cam-position reference, causing cascading driveability issues.
Diagnose by swapping the suspect coil with a known-good cylinder coil — if the misfire follows the coil, replace it. Before condemning the coil pack, inspect and clean the ICM-to-transmission ground stud: remove the bolt, wire-brush the contact surface on the transmission case down to bare metal, apply dielectric grease, and reinstall. Also clean and grease the ICM connectors. If grounds and coil swap don't fix it, replace the full coil pack assembly (~$80-150). Always replace the spark plugs and plug wires at the same time — the OE Champion plugs are specified for this engine; aftermarket platinum/iridium can cause its own misfires on the waste-spark system. Torque coil bolts carefully; the aluminum threads strip easily.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
AM Autoparts AM-25049835 Saturn 1.9L DIS ignition coil
Two coils are used; order only the diagnosed quantity and confirm model/year.
On the 1995-1999 Saturn S-Series, the 1.9L DOHC engine in the Saturn S-Series suffers from an intake manifold gasket failure where the OE one-piece gasket experiences compression set in the coolant passage between the manifold and the cylinder head, specifically at cylinder #4. Coolant leaks externally during cold-engine operation, sometimes evaporating before pooling on the ground, leading to mysterious coolant loss. A Saturn TSB documents the issue and the redesigned fix: a two-piece gasket consisting of a shorter orange intake manifold seal plus a separate black coolant seal made of a different elastomer. Most failures appear after 60,000 miles. The plastic intake manifold itself is also prone to broken coolant nipples.
Common Symptoms
Coolant loss with no obvious puddle
Sweet coolant smell after cold start
Visible coolant residue near cylinder #4 intake port
Slight overheating during long drives
Steam from engine bay during warm-up
Low coolant warning despite recent top-off
How to Fix
Replace the OE one-piece intake manifold gasket with Saturn's revised two-piece design (orange intake gasket + separate black coolant seal). Removal of the intake manifold also gives access to inspect and replace the brittle plastic coolant nipples that protrude from the manifold — these commonly snap off during service. Use new manifold bolts torqued to spec in the proper sequence. Total job is about 2-3 hours of labor. Always pressure-test the cooling system after the repair to verify the seal. While the intake is off, this is also a good time to clean the EGR passages, which are typically clogged on these engines.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Fel-Pro MS 95630 lower intake-manifold gasket set
1995-1999 Saturn SL2 1.9L and equivalent SC2/SW2 DOHC applications after model/VIN confirmation; retailer's direct page spans 1991-1999 SL2.
On the 1996-1999 Saturn S-Series, beginning with OBD-II in 1996, the Saturn S-Series 1.9L EGR system is highly susceptible to carbon clogging. The narrow gap between the EGR pintle and its passage is easily fouled by exhaust carbon, especially on engines that burn oil (a chronic issue on this engine — see the oil consumption issue). The most common codes are P0401 (insufficient EGR flow), P0404 (EGR control circuit range/performance), and the Saturn-specific P1404 (EGR closed position). Replacing the valve alone rarely fixes the problem because the EGR passages in the cylinder head and intake manifold are also clogged. The condition worsens markedly once oil consumption begins.
Check Engine Light with code P0401, P0404, or P1404
Rough idle, especially after warm-up
Engine stumble on light acceleration
Stalling when coming to a stop
Failed emissions/smog test
Hesitation under light throttle
How to Fix
Remove the EGR valve and clean it: fill the valve body with carb cleaner, soak for 15 minutes, drain, and repeat 5-10 times. Use a T-handle Torx driver to manually work the pintle up and down to break free carbon deposits. Critically, also clean the EGR passages in the intake manifold and the supply tube/passage in the cylinder head — these are usually more clogged than the valve itself. A wire brush, pipe cleaners, and aerosol carb cleaner work well. If oil consumption is significant, expect the EGR to re-clog within 10,000-20,000 miles. Address oil consumption first for a lasting fix. Replacement EGR valves are inexpensive (~$50-80) but useless if the passages are not cleaned.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Standard Motor Products EGV544 EGR valve with gasket
Confirm exact model, engine, emissions configuration and connector.
CERTAIN PRO-A MOTORS CORNER LAMPS, TURN SIGNALS, AND HEADLIGHTS SOLD AS REPLACEMENT LAMPS FOR USE ON CERTAIN PASSENGER VEHICLES LISTED ABOVE. SOME COMBINATION LAMPS THAT ARE NOT EQUIPPED WITH AMBER SIDE REFLECTORS FAIL TO CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT.
Campaign #06E02600023/03/2006
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What are the most common Saturn S-Series problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1998 Saturn S-Series has 3 documented issues. The most frequently reported are: DIS Ignition Module / Coil Pack Failure Causing Cylinder Misfires, Intake Manifold Gasket Coolant Leak at Cylinder #4 (DOHC 1.9L), EGR Valve Clogging Causing P0401/P0404/P1404 Codes. None are rated critical, but regular maintenance is recommended.
Is the Saturn S-Series reliable?
The 1998 Saturn S-Series has 3 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Saturn S-Series problems?
Repair costs for known Saturn S-Series issues range from $20 to $450, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1991-1999 Saturn S-Series DIS Ignition Module / Coil Pack Failure Causing Cylinder Misfires?
The Saturn S-Series uses a Distributorless Ignition System (DIS) with a waste-spark coil pack mounted on top of the engine. The coils and the Ignition Control Module (ICM) fail with age, throwing P0300-series misfire codes (commonly P0301 or P0302). A subtle but documented contri… Repairs typically run $50-$300. Severity: medium.
What is the 1995-1999 Saturn S-Series Intake Manifold Gasket Coolant Leak at Cylinder #4 (DOHC 1.9L)?
The 1.9L DOHC engine in the Saturn S-Series suffers from an intake manifold gasket failure where the OE one-piece gasket experiences compression set in the coolant passage between the manifold and the cylinder head, specifically at cylinder #4. Coolant leaks externally during col… Repairs typically run $150-$450. Severity: medium.
What is the 1996-1999 Saturn S-Series EGR Valve Clogging Causing P0401/P0404/P1404 Codes?
Beginning with OBD-II in 1996, the Saturn S-Series 1.9L EGR system is highly susceptible to carbon clogging. The narrow gap between the EGR pintle and its passage is easily fouled by exhaust carbon, especially on engines that burn oil (a chronic issue on this engine — see the oil… Repairs typically run $20-$250. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
