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 E013, Right Oxygen (O2) Sensor Not Ready: Action
PCM turns on SERVICE ENGINE SOON light and "closed loop" is disabled. When at operating temperature, a properly operating O2 sensor will drive PCM .45-volt reference signal lower (less than .45 volt) to indicate a lean mixture and higher (greater than .45 volt) to indicate a rich mixture. If O2 sensor does not vary from cold or not-ready voltage under test conditions, PCM assumes sensor cannot respond to air/fuel mixture changes and sets a PCM Code E013.
- A voltage of .42-.48 displayed is a reference from PCM. O2 sensor must generate .15 volt greater than .45 reference voltage to register a cross count in PCM.
- PCM compares voltage on circuit No. 412 to ground voltage on circuit No. 413. O2 sensor ground and PCM ground on terminal E15 must indicate good continuity (no voltage difference) 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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