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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSHYUNDAI2005SANTA FE GLS, 2.7 D, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM DIAGNOSIS (2.7L) (1 OF 2)DTC TROUBLESHOOTING PROCEDURESDTC P0140: HO2S CIRCUIT NO ACTIVITY DETECTED (BANK 1/SENSOR 2)DTC DETECTING CONDITION

2005 Hyundai Santa Fe GLS, 2.7 D, AWD

DTC P0140: Ho2S Circuit No Activity Detected (Bank 1/Sensor 2): DTC Detecting Condition

2005 Hyundai Santa Fe GLS, 2.7 D, AWDSECTION DTC Detecting Condition

DTC DETECTING CONDITION

Item		Detecting Condition	Possible Cause
Case 1)	DTC Strategy	Sensor voltage excursion for Lean and Rich mixture	Related fuse blown or missing Contact resistance in connectors HO2S contamination
	Enable Conditions	Sensor preheating and full heating phases finished Full Phase finished Integrated MAF in Fuel cut-Off < 18g Integrated MAF after Fuel cut-Off < 40g
	Threshold Value	Signal increase > 30mV
	Diagnostic Time	0.3 sec.
Case 2)	DTC Strategy	Sensor voltage excursion
	Enable Conditions	Sensor preheating and full heating phases finished Fuel cut-off phase Integrated MAF after starting fuel cut-off < 20g
	Threshold Value	Voltage with fuel cut off < 0.2V
	Diagnostic Time	5 sec.
MIL On Condition		2 Driving Cycles

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.