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 MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 37 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L CNG)DIAGNOSTIC TESTSDTC P0171: FUEL TRIM SYSTEM LEANTEST DESCRIPTION
2001 Chevrolet Cavalier LS, 2.4 T
Test Description
2001 Chevrolet Cavalier LS, 2.4 TSECTION Test Description
WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The number below refer to the step number on the diagnostic procedure.
- 4
The engine may also have a higher than normal idle if a vacuum leak is present.An exhaust system leak may be very small and cause the oxygen sensor to sense a false lean condition.
- 8
When testing the circuits for continuity the resistance should be less than 5 ohms. When testing the circuits for shorts the resistance should measure infinite with all components disconnected from the circuit. - 9
This step determines if a base engine concern is causing the lean condition or if the lean condition is only present when operating on CNG.
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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.