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CODE 181, from service manual: DTC -- HO2S Orientation -- Fault Definition 181 -- Right or Rear -- Rich limit reached. Possible Causes: -- Fuel pressure -- Fuel injector -- Air intake -- MAP sensor -- Fuel injector electrical circuit -- Fuel filter -- Vacuum -- Air filter CODE 186, from service manual: G6 VISUALLY INSPECT MAF SENSOR Continuous Memory DTC 184 indicates MAF value is higher than expected. Continuous Memory DTC 185 indicates MAF value is lower than expected. NOTE: If further description is required for the In-Range Test, refer to Quick Test Appendix,
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