Hyundai Santa Fe (2006 year). Manual - part 543
FLA -238
FUEL SYSTEM
DTC P0131 HO2S CIRCUIT LOW VOLTAGE (BANK 1 / SENSOR 1)
COMPONENT LOCATION
E5E16663
HO2S [Bank 1/Sensor 1]
LGLG504A
GENERAL DESCRIPTION
E9CECC3F
In order to control emissions of the CO, HC and NOx components of the exhaust gas, heated oxygen sensor (HO2S),
mounted on the front side and rear side of catalytic converter, detects the oxygen content in the exhaust gas. The front
HO2S signal is used to control air/fuel ratio (closed loop fuel control) and the rear HO2S signal is used to monitor front
HO2S and catalyst for proper operation. The HO2S requires a minimum temperature to operate properly and provide a
closed loop fuel control system. The HO2S contains the heater element to reduce its warming-up time and ensure its
performance during all driving conditions. The oxygen sensor generates a voltage that indicates the difference between
the oxygen content of the exhaust stream and the oxygen content of ambient air. When the exhaust stream is “ rich,”
there is more oxygen in the ambient air than in the exhaust stream, so the voltage will be higher.
DTC DESCRIPTION
E8D2EB10
Checking output signals from HO2S under detecting condition, if an output signal is below 0.04V for more than predeter-
minate time, PCM sets P0131. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2
driving cycle.
DTC DETECTING CONDITION
E2DEFF6E
Item
Detecting Condition
Possible cause
DTC Strategy
• Monitor signal voltage
Enable Conditions
• Battery voltage ≥ 10V
• Engine running ≥ 60 sec.
• Engine warm-up state
Threshold value
• The voltage of HO2S(B1/S1) ＜ 0.04V
Diagnosis Time
• Continuous
(more than 12.5 sec. failure for every 15 sec.test)
MIL On Condition
• 2 Driving Cycles
• Poor Connection
• Short to ground in harness
• HO2S(B1/S1)
• PCM