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.
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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 42 (ENGINE CONTROLS - TROUBLESHOOTING & DIAGNOSIS)DIAGNOSTIC PERFORMANCE & PROCEDURESINSPECTION/MAINTENANCE (I/M) CATALYST SYSTEM SET PROCEDURECONDITIONS FOR RUNNING
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Conditions for Running
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Conditions for Running
WARNING: This page is about a different car, the 2005 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.
DTCs P0421 and P0431 are not set.
- The engine load is between 20 and 45 percent.
- The manifold absolute pressure (MAP) sensor variation is less than 6 kPa.
- The catalytic temperature is more than 350°C (662°F).
- The engine is in Closed Loop fuel control.
- The engine speed is between 1,000-2,120 RPM.
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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.