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 MANUALSFORD2009FUSION SEL, 3.0 1, FWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P0133: - O2 CIRCUIT SLOW RESPONSE (BANK 1, SENSOR 1)
2009 Ford Fusion SEL, 3.0 1, FWD
DTC P0133: - O2 Circuit Slow Response (Bank 1, Sensor 1)
2009 Ford Fusion SEL, 3.0 1, FWDSECTION DTC P0133: - O2 Circuit Slow Response (Bank 1, Sensor 1)
DTC P0133: - O2 CIRCUIT SLOW RESPONSE (BANK 1, SENSOR 1)
| Description: | For the Flex, MKS, Sable PZEV, Taurus PZEV, Taurus X PZEV, the powertrain control module (PCM) commands an air/fuel ratio that changes in the shape of a square wave. The PCM calculates the length of the resulting signal from the HO2S. The test fails when the length of the signal is less than a calibrated limit. For all others, the PCM checks the HO2S signal frequency and amplitude. The test fails when the frequency and amplitude less than a calibrated limit. |
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| Possible Causes: |
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| Diagnostic Aids: | Access the HO2S test results from the generic OBD menu to verify the DTC. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| E-Series 4.6L, E-Series 5.4L, Expedition, F-150, Flex, MKS, Navigator, Sable PZEV, Taurus PZEV, Taurus X PZEV |
- | - | GO to Pinpoint Test DZ . |
| All others | - | - | GO to Pinpoint Test DW . |
RENDER: 1.0x
NO RELATED
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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.