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 E044, Right Oxygen (O2) Sensor Lean Signal: Action
PCM turns on SERVICE ENGINE SOON light. PCM turns on canister purge solenoid.
- With O2 sensor disconnected, parameter ED33 should remain at reference voltage (.38-.63 volt).
- Checks for sensor ability to record rich readings. DVOM set on volts will provide a few billionths of an amp to drive circuit No. 412 to greater than .64 volt (rich). Similar results may be obtained by placing a finger on battery positive terminal and another finger on O2 sensor circuit No. 412 harness terminal.
- PCM compares O2 sensor signal voltage received on circuit No. 412 and to ground voltage on circuit No. 413. If PCM does not have a good ground to engine on circuit No. 413, O2 sensor can appear falsely high or low. With engine running, use a voltmeter to measure voltage drop between O2 sensor at exhaust manifold and PCM terminal E15. If voltage is -.05 to +.05 volt, ground is okay. If voltage is less than -.05 volt or greater than +.05 volt, repair poor ground on circuit No. 413 between PCM terminal E15 and ground.
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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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