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 MANUALSFORD2005ECONOLINE E150, VAN CARGO, 5.4 LREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTION (EXCEPT DIESEL & HYBRID)DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONSDTC P0135: HO2S CIRCUIT MALFUNCTION (HO2S-11)
2005 Ford Econoline E150, Van Cargo, 5.4 L
DTC P0135: HO2S Circuit Malfunction (HO2S-11)
2005 Ford Econoline E150, Van Cargo, 5.4 LSECTION DTC P0135: HO2S Circuit Malfunction (HO2S-11)
P0135 - HO2S CIRCUIT MALFUNCTION (HO2S-11)
| Description: | During testing the heated oxygen sensor (HO2S) heaters are checked for opens/shorts and excessive current draw. The test fails when the current draw exceeds a calibrated limit and/or an open or short is detected. | ||
| Possible Causes: |
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| Diagnostic Aids: | Wiring. Damaged HO2S heater. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to H: Fuel Control STEP H7. | ||
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.