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
2001 Chevrolet Cavalier LS, 2.4 TSECTION Description
WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. 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 - Catalyst System Low Efficiency
EVAP System
- P0440 - EVAP System
- P0442 - EVAP System - Small Leak Detected
- P0446 - EVAP Canister Vent Blocked
- P1441 - EVAP System Flow During Non-Purge
Oxygen Sensor System
- P0133 - HO2S Slow Response
- P0140 - HO2S Circuit Insufficient Activity (Bank1; Sensor 2)
- P1133 - HO2S Insufficient Switching (Bank 1; Sensor 1)
Oxygen Sensor Heater System
- P0141 - HO2S Heater Performance (Bank 1; Sensor 2)
Diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
RENDER: 1.0x
NO RELATED
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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.