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Definition of check engine code P1166:
Acura:
Primary HO2S (No. 1) Heater System Electrical
Daewoo:
IDLE RATIO TRIM MAL
Honda:
Air / Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Electrical Problem A/F sensor heater,or Heated Oxgen Sensor Sensor1 (Primary HO2S) Heater Circuit Malfunction (HO2S)
Hyundai:
HO2S Bank 1 Sensor 1 Controller Adaptive Diagnosis Fault (Bank 1)
Nissan:
Heated O2 Sensor 2
Volkswagen/Audi:
Bank1,Long Term Fuel Trim,Range 2 Rich Limit Exceeded
Volvo:
Bank1,Long Term Fuel Trim,Range 2 Rich Limit Exceeded
GM:
Oxygen Sensor System - Low Voltage During Power Enrichment (Bank 1 - Sensor 1)