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 MANUALSHYUNDAI2014EQUUS SIGNATUREREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM DIAGNOSIS (1 OF 3)DTC P0136: O2 SENSOR CIRCUIT(BANK 1/SENSOR 2)COMPONENT INSPECTION
2014 Hyundai Equus Signature
Component Inspection
2014 Hyundai Equus SignatureSECTION Component Inspection
- Visual Check
- IG "OFF" & Disconnect HO2S (B1/S2) connector.
- Check that HO2S (B1/S2) is contaminated or damaged by foreign materials.
- Has a problem been found?
YES
- Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. So, check poor connections and the related circuit between ECM and component thoroughly. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Substitute with a known - good HO2S (B1/S2) and check for proper operation. If the problem is corrected, replace HO2S (B1/S2) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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.