ATTENTION: GENERAL MANAGER PARTS MANAGER CLAIMS PERSONNEL SERVICE MANAGER IMPORTANT - All Service Personnel Should Read and Initial in the boxes provided, right. APPLICABILITY: SUBJECT: SERVICE BULLETIN 1999MY and later Forester 1999MY and later Impreza 2000MY and later Legacy 2006MY and later Tribeca and Oxygen NUMBER: 11-92-08 DATE: 01/05/09 Introduction This bulletin is for information purposes only. Repair/Service Information When performing diagnostics or reading Diagnostic Trouble Codes (DTC) for Air Fuel Ratio (A/F) sensors and Oxygen (O2) sensors use the following information to identify, locate and repair the appropriate sensor and sensor circuits: (1) Rarely will multiple sensors fail at the same time. (2) On vehicles with only one O2 sensor, the designation for that O2 sensor will be bank 1. (3) On vehicles with only one A/F sensor, the designation for that A/F sensor will be bank 1. (4) Any reference to sensor 1 is an A/F sensor. (5) Any reference to sensor 2 is an O2 sensor. (6) Early PZEV vehicles used an additional O2 sensor behind the rear catalyst and is designated sensor 3. (7) On vehicles with A/F and O2 sensors on the right (Passenger Side) and left (Driver side) of the vehicle, Bank 1 is the right side (Passenger Side) and Bank 2 is the left side (Driver side). Example: DTC P0030 HO2S HEATER CONTROL CIRCUIT (Bank 1 1). This DTC is referring to the A/F sensor and since it is on a 2007 Forester there is only one A/F sensor and one O2 sensor. CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS. Subaru Service Bulletins are intended for use by professional technicians ONLY. They are written to inform those technicians of conditions that may occur in some vehicles, or to provide information that could assist in the proper servicing of the vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do the job correctly and safely. If a condition is described, DO NOT assume that this Service Bulletin applies to your vehicle, or that your vehicle will have that condition. Subaru of America, Inc. is ISO 14001 Compliant The international standard for excellence in Environmental Management Systems. Please recycle or dispose of automotive products in a manner that is friendly to our environment and in accordance with all local, state and federal laws and regulations. Bulletin Number: 11-92-08; Date: 01/05/09 Page 1
Example (as illustrated): DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (Bank 1 2). This DTC is referring to the O2 sensor on the right side exhaust (or the O2 sensor of a vehicle with only one O2 sensor). Refer to the illustrations for more details on locating the appropriate sensors. 2001-2004 3.0 Liter Bank 1 1 AF Bank 1 2 O2 Bank 2 1 AF 2005 - Present 3.0 & all 3.6 Liter Bank 2 1 A/F Bank 1 1 A/F Bank 2 2 O2 Bank 1 2 O2 Bulletin Number: 11-92-08; Date: 01/05/09 Page 2
2006 - Present PZEV & Federal Spec. Bank 1 2 O2 Bank 1 1 A/F Bulletin Number: 11-92-08; Date: 01/05/09 Page
Pre 2006 2.5 Liter Natrually Aspirated Bank 1 2 O2 Bank 1 1 AF 2.0 and 2.5 Liter Turbo Bank 1 1 A/F Bank 1 2 O2 The following is a list of A/F related DTCs. (This list is for example only. Refer to the applicable service manual for a complete list of DTCs.) P0030, P0031, P0032 P0050, P0051, P0052 P0130, P0131, P0132, P0133, P0134, P0135 P0150, P0151, P0152. P0153. P0154 P1130, P1131, P1135, P1136, P1137, P1139 P1140 P1152, P1153, P1154, P1155 Note: When the DTCs for A/F sensor are stored in memory, do not replace the oxygen sensor. Bulletin Number: 11-92-08; Date: 01/05/09 Page
The following is a list of O2 related DTCs. (This list is for example only. Refer to the applicable service manual for a complete list of DTCs.) P0037, P0038 P0136, P0137, P0138, P0139, P0140, P0141 P0057, P0058 P0156, P0157, P0158, P0159, P0160, P0161 P0043, P0044 P0142, P0143, P0144, P0145, P0146 Note: When the DTCs for O2 sensor are stored in memory, do not replace the A/F sensor. P Code List (Partial list) P Code SSM indication 1 SSM indication 2 Detection method of abnormality P0030 O2 Heater Performance(Bank1 1) / P0031 P0032 P0037 P0038 P0043 P0044 P0050 P0051 P0052 P0057 P0058 Control Low Control High Control Low Control High Control Low Control High O2 Heater Control Low Control High Control Low Control High (Bank1 1) (Bank1 1) voltage is high (Bank1 2) Oxygen (Bank1 2) Oxygen voltage is high (Bank1 3) Oxygen (Bank1 3) Oxygen voltage is high Performance(Bank2 1) (Bank2 1) (Bank2 1) / voltage is high (Bank2 2) Oxygen (Bank2 2) Oxygen voltage is high Bulletin Number: 11-92-08; Date: 01/05/09 Page 5
P Code SSM indication 1 SSM indication 2 Detection method of abnormality P0130 (Bank1 1) P0130 P0131 P0132 P0133 P0134 P0135 (Lean) O2 Heater (Bank1 1) (Bank1 1) (Bank1 1) (Bank1 1) (Bank1 1) (Bank1 1) abnormal input value abnormal input value lean voltage is high / P0136 (Bank1 2) Oxygen abnormal input value P0137 P0138 P0139 P0140 P0141 O2 Heater (Bank1 2) Oxygen (Bank1 2) Oxygen voltage is high (Bank1 2) Oxygen Abnormal Performance (Bank1 2) Oxygen (Bank1 2) Oxygen / P0142 (Bank1 3) Oxygen abnormal input value P0143 P0144 P0145 P0146 (Bank1 3) Oxygen (Bank1 3) Oxygen voltage is high (Bank1 3) Oxygen Performance (Bank2 1) P0150 (Bank2 1) P0151 P0152 P0153 (Bank2 1) (Bank2 1) (Bank2 1) abnormal input value voltage is high Bulletin Number: 11-92-08; Date: 01/05/09 Page
P Code SSM indication 1 SSM indication 2 Detection method of abnormality P0154 (Bank2 1) P0156 (Bank2 2) Oxygen abnormal input value P0157 P0158 P0159 P0160 P0161 P1130 P1131 P1135 P1136 P1137 P1137 P1139 P1140 P1152 P1153 P1154 P1155 O2 Heater (Short) (Short) (Mid) (Lamda = 1) O2 Heater O2 Heater (Bank2 2) Oxygen (Bank2 2) Oxygen voltage is high (Bank2 2) Oxygen Abnormal Performance (Bank2 2) Oxygen (Bank2 2) Oxygen Abnormal voltage/ (Bank1 1) (Bank1 1) (Bank2 1) (Bank2 1) (Bank1 1) (Bank1 1) Performance (Bank1 1) Performance (Bank2 1) Performance(Low) (Bank1 1) Performance(High) (Bank1 1) Performance(Low) (Bank2 1) Performance(High) (Bank2 1) outside voltage range outside voltage range Bulletin Number: 11-92-08; Date: 01/05/09 Page 7