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 452 (ENGINE CONTROLS - 3.5L (L66) - DTC P0030 TO DTC P0206)DTC P0171 OR P0174DTC DESCRIPTORSNOTES
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
DTC Descriptors: Notes
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Notes
WARNING: This page is about a different car, the 2006 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic procedure supports the following DTCs:
- DTC P0171 HO2S Fuel Trim System Lean Bank 1
- DTC P0174 HO2S Fuel Trim System Lean Bank 2
DTC P0171 or P0174
| HO2S Indication | Short Term FT Action | Long Term FT Action | Short Term FT Response |
|---|---|---|---|
| Lean Condition | Quick Increase of 1% or More | Slow Increase of 1% or More | Return to 0% |
| Desired Condition | Stays Near 0% | Stays at Learned +/- Value | Stays Near 0% |
| Rich Condition | Quick Decrease of -1% or Less | Slow Decrease of -1% or Less | Return to 0% |
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.