2004 Hyundai Sonata Q&A
2004 Hyundai Sonata Question: Codes P1166 & P1167
The codes P1166 and P1167 have to do with the Computer System adapting the Fuel Mixture to a compensation set point and when it can't go any farther, the Computer sets a code P1166 when the system is still too Rich and or a code P1167 when it is too Lean. Here are 2 articles about these codes in the more common code format i.e P0171 and P0172 I wrote these articles because many shops are stumped with these problems and I do Emissions work in CA and have to solve these problems every day, so I have spent a lot of time on them. http://repairpal.com/OBD-II-Code-P0171-and-P0174 http://repairpal.com/OBD-II-Code-P0172-and-P0175 read these complete articles, even though it may seem really boring, these code conditions still throw more shops than any other codes. Then take your car to a good shop that can read and understand these articles and do a proper Diagnosis, by following the Inspections in these articles. Don't rule out a defective Mass Air Flow Sensor and if so, ONLY use a factory replacement part, as this part is a critically precise component and the after market sensors have lots of problems. http://repairpal.com/estimator?car_type_id=4010 - dandd
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