If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the ECM uses A/F feedback control to issue a Rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich, and the ECM uses A/F feedback control to issue a Lean command." property="og:description">
For Shop Owners

P1166 - Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • Faulty Air/Fuel Ratio Sensor 1
  • Air/Fuel Ratio Sensor 1 harness is open or shorted
  • Air/Fuel Ratio Sensor 1 circuit poor electrical connection
What does this mean?

When is the code detected?

If the element is not activated or the Engine Control Module (ECM) terminal voltage is a set value or less for at least a set time period when the power is drawn to the A/F sensor (sensor 1) heater, a malfunction is detected and the code is stored.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1166 Description

The Air/Fuel Ratio (A/F) sensor 1 is installed in the exhaust system and detects oxygen content in the exhaust gas. The A/F sensor transmits output voltage to the Engine Control Module (ECM). A heater for the sensor element is embedded in the A/F sensor (sensor 1). It is activated and heats the sensor to stabilize and speed the detection of oxygen content by controlling current flowing through the heater. An increase in the current levels off as the applied voltage to the element electrode reaches a certain range because the amount of oxygen which is led through the diffusion layer is limited. The current amperage is proportional to oxygen content in the exhaust gas, so the air/fuel ratio is detected by the measurement of the current amperage. The ECM compares a set target air/fuel ratio with the detected air/fuel ratio and controls the fuel injection timing.

If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the ECM uses A/F feedback control to issue a Rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich, and the ECM uses A/F feedback control to issue a Lean command.

OBDII Code P1166 - Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction - itimaster.ru

P1166 Information for specific makes

P1166 ACURA Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction
P1166 AUDI Bank 1 Long Term Fuel Trim Range 2 Rich Upper Limits Exceeded
P1166 HONDA Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction
P1166 HYUNDAI O2 Sensor System Lambda Controller at the Limit Bank 1
P1166 INFINITI Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2
P1166 KIA O2 Sensor System Lambda Controller at the Limit Bank 1
P1166 NISSAN Heated Oxygen Sensor 2 Minimum Voltage Monitoring Bank 2
P1166 SUZUKI HO2S Circuit Low Voltage During Power Enrichment Sensor 1
P1166 VOLKSWAGEN Bank 1 Long Term Fuel Trim Range 2 Rich Upper Limits Exceeded

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P1166 Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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