The codes do not necessarily indicate any failed parts. You have to troubleshoot the system to figure out why the light is coming on. It might just be a loose wire somewhere. What codes have you been getting?
SOURCE: Misfire
One question, have you replaced the ECTS (Electronic Cooling Temperature Sensor)? These cause no end of different seemingly unrelated problems on Saturns. Peice is about ten bucks and is an easy install. Just search on youtube for a how-to video. Even if that's not the problem it is reccommended to replace this peice just the same as they ALL end up going bad at some point.
If that's not a fix, start pulling plugs. Check to see if they're correctly gapped and if they have any damage/corrosion. If you're running Platinum plugs, immediatly change to a copper plug as Platinums have no place in these motors. Most people have the best luck with NGK copper.
Check to make sure that your plug wires haven't been crossed. This sounds like a plug or wire issue most likely so it has to be in that family, if the plugs are good, wires good and not crossed, sensors are fine, then time to replace your coil packs. If you've replaced everything up to the coil packs then that is most likely the cause of your dillema.
SOURCE: 1998 Saturn SC1 transmission
if there a small leak in the tank the faster you go the more pressure there is and that pressure opens up hta hole and lets that fluid out
SOURCE: 99 Saturn SC1 ''Service engine soon'' light is on.
Did you get the code that triggered the SEL? If you know that, it will be easier to diagnose your problem. You can do it without a tool on the old saturns. Just need a paperclip. :
Use a paper clip to jumper Terminal A and B of the ALDL *Assembly Line Diagnostic Link* which is above your left knee.
Terminal A is an interal ground and is the top right terminal in the
connector. Terminal B is directly adjacent and to the left of Terminal
A.
Turn the ignition to ON.
All codes are 2 digits between 11 and 99. Codes are displayed on the
SES light by flashing the light with short and long pauses to
distinguish digits of one code from digits of another. The short pause
is used between digits of the same code, long pauses are between codes.
Also, each code is flashed three times before going to the next code.
For example, the sequence of code 12 will be: flash, pause,
flash-flash, long pause, then repeat 2 times. If Code 12 is not
displayed, the self-diagnostic pogram i snot functioning properly.
If only Code 12 is displayed, no system malfunctions have been stored.
Any existing system fault codes are displayed in order from low to high, except for Code 11.
On vehicles with an automatic transaxle and on which exist stored
transaxle codes, Code 11 will be displayed last, then the SHIFT TO D2
light will begin flashing transaxle codes of flags.
When all engine codes have been displayed, Code 12 will flash again.
Diagnostic Codes
11. Transaxle Codes present
12. Diagnostic System Check
13. Oxygen sensor, circuit open or not ready
14. CTS circuit, out of range high
15. CTS circuit, out of range low
17. PCM fault, pullup resistor
19. 6x signal fault, no 6x signal between reference pulses
21. TPS circuit, out of range high
22. TPS circuit, out of range low
23. ATS circuit, out range low
24. VSS circuit, no signal
25. ATS circuit, out or range high
26. Quad Driver output fault
32. EGR system fault
33. MAP sensor circuit, out of range high
34. MAP sensor circuit, out of range low
35. IAC valve, rpm out of range
41A EST circuit open
41B EST circuit shorted
42A Bypass circuit grounded
42B Bypass circuit open
42C Bypass circuit shorted
41. EST bypass, open or shorted
42. EST bypass, open or shorted
43. ECS (knock sensor) circuit open or shorted
44. Oxygen sensor indicates system lean
45. Oxygen sensor indicates system rich
46. Power steering pressure switch circuit, open
49. Idle rpm out of limit high (vacuum leak)
51. PCM memory error
55. A/D converter error in PCM
81. ABS message fault (1993 vehicles with TCS)
82 PCM internal communication fault
Diagnostic Flags
27. Quick quad driver output fault (1993 only)
48. Reference imput intermittent or noisy
52. Battery voltage out of range
53. ESC knock present
54. Five volt reference ground
58. Battery voltage unstable
61. 6x signal fault
63. Option check sum error
67. Handwheel sensor circuit fault
71. Cooling system temperature high
72. Coolinng system temeprature low
73. CTS sensor unstable
74. CTS/transaxle temperatuer sensor ratio error
76. ATS sensor unstable
83. Low coolant (1993 only)
SOURCE: Saturn sl 99 will crank but won't start
i have found on that car if the temp sensor is unpluged or is bad oddly enough it wont let the car start you should check it and or replace it
SOURCE: EGR Valve, O2 Sensor
Absolutely a bad o2 sensor can cause problems with performance. If you replace one it is highly recommended to replace both or all four depending on your vehicle. If one o2 sensor is making your vehicle run rich you will burn more fuel and in return increase the amount of carbon or unburnt fuel if you will in your egr valve you could probably get away with cleaning it but I would recommend replacing it, it will save you from having to pull it off again. Check your catyletic converter because long exposure to carbon will mess it up.
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