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 MANUALSKIA2015RIO EX, 4D SEDANREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM DIAGNOSIS (1 OF 2)DTC P0135: O2 SENSOR HEATER CIRCUIT (BANK 1/ SENSOR 1)INSPECTION REPAIRCOMPONENT INSPECTION

2015 Kia Rio EX, 4D Sedan

Component Inspection

2015 Kia Rio EX, 4D SedanSECTION Component Inspection

Check Resistance

IG KEY "OFF".
Disconnect HO2S (S1) connector.

Measure resistance between heater power and heater control terminal of HO2S (S1) (Component Side)

ITEM SPECIFICATION

Item	Specification
Heater Resistance (Ω)	Approx. 3.2Ω ± 0.8Ω at 20°C (68°F)

Fig 1: Measuring Resistance Between Heater Power And Heater Control Terminal Of HO2S (S1)

Courtesy of KIA MOTORS AMERICA, INC.

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.