Engine-Codes - KIA - P1166 KIA

P1166 KIA Code - O2 Sensor System Lambda Controller at the Limit Bank 1

- Code Popularity: 40,470 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents
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What are the Possible Causes of the DTC P1166 KIA?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Air leakage or restriction in intake or exhaust system
  • Dirty engine oil or oil level too high
  • Front HO2S or MAFS contamination
  • Fuel system
  • EVAP system
  • Faulty sensor signals
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How to Fix the DTC P1166 KIA?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1166 KIA code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the P1166 KIA Code Mean?

The Lambda closed-loop control system is included in the engine's control system. The control system regulates the lambda upstream with the HO2S signal. Rich mixtures generate high concentrations of CO, H2, and HC. Lean mixtures generate the high concentrations of NOx, and free oxygen.
If the lambda controller reaches the maximum or minimum threshold, then feedback control is no longer possible and emissions will be increased. The ECM sets DTC P1166 if no proportional fuel adaptation occurs for a defined time after the lambda controller has reached its minimum or maximum threshold.

P1166 KIA Code - O2 Sensor System Lambda Controller at the Limit Bank 1

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