Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Cadillac Seville SLSFACTORY OEM SERVICE PROCEDURE
Inspection/Maintenance System DTC Table
NOTE:
Not all vehicles will have every Diagnostic Trouble Code (DTC) listed in each section. For example, a vehicle may have only 2 oxygen sensors or 1 catalyst. Only those DTCs applicable to the vehicle are required to update each System Status to YES. Refer to the appropriate service manual to determine which DTCs are supported for each vehicle.
INSPECTION/MAINTENANCE SYSTEM DTCS
| System | DTCs Required To Set System Status To YES |
|---|---|
| AIR | DTCs P0410 , P1415 & P1416 |
| Catalyst | DTC P0420 |
| Exhaust Gas Recirculation (EGR) | DTCs P0401 , P0404 , P0405 & P1404 |
| Evaporative (EVAP) Emission | DTCs P0440 , P0442 , P0446 & P1441 |
| Oxygen Sensor | DTCs P0133 , P0140 , P0153 , P1133 , P1134 , P1153 & P1154 |
| Oxygen Sensor Heater | DTCs P0135 , P0141 & P0155 |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.