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.
2018 Ford Fiesta STFACTORY OEM SERVICE PROCEDURE
DTC P0405 - EGR Sensor A Circuit Low
P0405 - EGR SENSOR A CIRCUIT LOW
| Description: | The exhaust gas recirculation (EGR) monitor checks the EGR valve position sensor signal to the PCM for low voltage. This DTC sets when the average voltage to the PCM drops to a voltage less than the minimum calibrated value. | ||
| Possible Causes: |
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| Diagnostic Aids: | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST KD . | ||
Factory Service Tools
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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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