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.
Pcm Code E017, Left Oxygen (O2) Sensor Not Ready: Action
PCM turns on SERVICE ENGINE SOON light and "closed loop" is disabled.
- A voltage of .42-.48 displayed is a reference voltage from PCM. Oxygen sensor must generate .15 volt greater than .45 reference to register a cross count in PCM.
- PCM compares voltage on circuit No. 1589 to ground voltage on circuit No. 413. O2 sensor ground and PCM ground on terminal B6 must be at same voltage potential with engine running.
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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.
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