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.
Inspection/Maintenance System DTCS: Description
2004 Oldsmobile Bravada RWDSECTION Description
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
The following DTCs are required to set system status to YES:
Catalyst System
- P0420 - TWC System - Low Efficiency
EGR System
- DTC P0401 - EGR Flow Error
- DTC P0404 - EGR Position Sensor Performance
- DTC P0405 - EGR Sensor Circuit - Low Voltage
- DTC P1404 - EGR System
EVAP System
- P0440 - EVAP Emission System
- P0442 - EVAP System Emission Control System - Small Leak Detected
- P0446 - EVAP Vent System Performance
- P1441 - Evaporative Emission System Flow During Non-Purge
Oxygen Sensor
- P0133 - HO2S 1 Slow Response
- P0140 - HO2S 2 Circuit - Insufficient Activity
- P1133 - HO2S Insufficient Switching - Sensor 1
Oxygen Sensor Heater
- P0135 - HO2S 1 Heater Circuit
- P0141 - HO2S 2 Heater Circuit
Diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
RENDER: 1.0x
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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.