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 MANUALSFORD2010FOCUS S, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - PINPOINT TEST DY: ENGINE OIL TEMPERATURE (EOT) SENSOR THROUGH PINPOINT TEST HE: EXHAUST GAS RECIRCULATION (EGR) SYSTEMS - (EXCEPT DIESEL & HYBRID)PINPOINT TEST DZ: UNIVERSAL HEATED OXYGEN SENSOR (HO2S)NOTES
2010 Ford Focus S, Standard
Pinpoint Test DZ: Universal Heated Oxygen Sensor (HO2S): Notes
2010 Ford Focus S, StandardSECTION Notes
NOTE:
Proceed to appropriate testing steps for DTC P0040 listed in FAULT CODE SETTING CONDITION table of fault code setting condition.
FAULT CODE SETTING CONDITION
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Escape/Mariner 3.0L, E-Series 4.6L, E-Series 5.4L, Expedition, F-150, Flex, Fusion 3.0L, Milan 3.0L, MKS, MKT, Navigator, Taurus |
- | GO to PINPOINT TEST DZ . | - |
| All others | - | GO to PINPOINT TEST DW . | - |
RENDER: 1.0x
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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.