Air/Fuel Ratio Sensor And Oxygen Sensor (11-92-08)
Publication date: 2009-01-05Reference number: 11-92-08
AIR/FUEL RATIO SENSOR AND OXYGEN SENSOR
TECHNICAL SERVICE BULLETIN
Reference Number(s): 11-92-08, Date of Issue:
January 05, 2009
| SUBARU: | 1999MY and later Forester, Impreza; 2000MY and later Legacy; 2006MY and later Tribeca |
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:
- Rarely will multiple sensors fail at the same time.
- On vehicles with only one O2 sensor, the designation for that O2 sensor will be bank 1.
- On vehicles with only one A/F sensor, the designation for that A/F sensor will be bank 1.
- Any reference to sensor 1 is an A/F sensor.
- Any reference to sensor 2 is an O2 sensor.
- Early PZEV vehicles used an additional O2 sensor behind the rear catalyst and is designated sensor 3.
- 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 Sensor 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.
Example (as illustrated): DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (Bank 1 Sensor 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.
The following is a list of A/F Sensor 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.
The following is a list of O2 Sensor 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 (PARTIAL LIST)
| P CODE | SSM INDICATION 1 | SSM INDICATION 2 | SENSOR | DETECTION METHOD OF ABNORMALITY |
|---|---|---|---|---|
| P0030 | O2 Sensor Heater Circuit | Range/ Performance(Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal voltage/ current |
| P0031 | HO2S Heater Control Circuit Low | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | voltage is low |
| P0032 | HO2S Heater Control Circuit High | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | voltage is high |
| P0037 | HO2S Heater Control Circuit Low | (Bank1 Sensor2) | Oxygen Sensor | voltage is low |
| P0038 | HO2S Heater Control Circuit High | (Bank1 Sensor2) | Oxygen Sensor | voltage is high |
| P0043 | HO2S Heater Control Circuit Low | (Bank1 Sensor3) | Oxygen Sensor | voltage is low |
| P0044 | HO2S Heater Control Circuit High | (Bank1 Sensor3) | Oxygen Sensor | voltage is high |
| P0050 | O2 Sensor Heater Circuit | Range/ Performance(Bank2 Sensor1) | Air/Fuel Ratio Sensor | abnormal voltage/current |
| P0051 | HO2S Heater Control Circuit Low | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | voltage is low |
| P0052 | HO2S Heater Control Circuit High | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | voltage is high |
| P0057 | HO2S Heater Control Circuit Low | (Bank2 Sensor2) | Oxygen Sensor | voltage is low |
| P0058 | HO2S Heater Control Circuit High | (Bank2 Sensor2) | Oxygen Sensor | voltage is high |
| P0130 | O2 Sensor Circuit | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal input value |
| P0130 | O2 Sensor Circuit (Lean) | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal input value lean |
| P0131 | O2 Sensor Circuit Low Voltage | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | voltage is low |
| P0132 | O2 Sensor Circuit High Voltage | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | voltage is high |
| P0133 | O2 Sensor Circuit Slow Response | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P0134 | O2 Sensor Circuit (Open) | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P0135 | O2 Sensor Heater Circuit | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal voltage/current |
| P0136 | O2 Sensor Circuit | (Bank1 Sensor2) | Oxygen Sensor | abnormal input value |
| P0137 | O2 Sensor Circuit Low Voltage | (Bank1 Sensor2) | Oxygen Sensor | voltage is low |
| P0138 | O2 Sensor Circuit High Voltage | (Bank1 Sensor2) | Oxygen Sensor | voltage is high |
| P0139 | O2 Sensor Circuit Slow Response | (Bank1 Sensor2) | Oxygen Sensor | Abnormal response characteristic |
| P0140 | O2 Sensor Circuit Range/Performance | (Bank1 Sensor2) | Oxygen Sensor | abnormal voltage response |
| P0141 | O2 Sensor Heater Circuit | (Bank1 Sensor2) | Oxygen Sensor | abnormal voltage/current |
| P0142 | O2 Sensor Circuit | (Bank1 Sensor3) | Oxygen Sensor | abnormal input value |
| P0143 | O2 Sensor Circuit Low Voltage | (Bank1 Sensor3) | Oxygen Sensor | voltage is low |
| P0144 | O2 Sensor Circuit High Voltage | (Bank1 Sensor3) | Oxygen Sensor | voltage is high |
| P0145 | O2 Sensor Circuit Slow Response | (Bank1 Sensor3) | Oxygen Sensor | abnormal response characteristic |
| P0146 | O2 Sensor Circuit Range/Performance | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | abnormal voltage response |
| P0150 | O2 Sensor Circuit | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | abnormal input value |
| P0151 | O2 Sensor Circuit Low Voltage | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | voltage is low |
| P0152 | O2 Sensor Circuit High Voltage | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | voltage is high |
| P0153 | O2 Sensor Circuit Slow Response | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P0154 | O2 Sensor Circuit (Open) | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P0156 | O2 Sensor Circuit | (Bank2 Sensor2) | Oxygen Sensor | abnormal input value |
| P0157 | O2 Sensor Circuit Low Voltage | (Bank2 Sensor2) | Oxygen Sensor | voltage is low |
| P0158 | O2 Sensor Circuit High Voltage | (Bank2 Sensor2) | Oxygen Sensor | voltage is high |
| P0159 | O2 Sensor Circuit Slow Response | (Bank2 Sensor2) | Oxygen Sensor | Abnormal response characteristic |
| P0160 | O2 Sensor Circuit Range/Performance | (Bank2 Sensor2) | Oxygen Sensor | abnormal voltage response |
| P0161 | O2 Sensor Heater Circuit | (Bank2 Sensor2) | Oxygen Sensor | Abnormal voltage/current |
| P1130 | O2 Sensor Circuit (Open) | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P1131 | O2 Sensor Circuit (Short) | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | outside voltage range |
| P1135 | O2 Sensor Circuit (Open) | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P1136 | O2 Sensor Circuit (Short) | (Bank2 Sensor1) | Air/Fuel Ratio Sensor | outside voltage range |
| P1137 | O2 Sensor Circuit (Mid) | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P1137 | O2 Sensor Circuit (Lamda = 1) | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P1139 | O2 Sensor Heater Circuit Range/Performance | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P1140 | O2 Sensor Heater Circuit Range/ | Performance (Bank2 Sensor1) | Air/Fuel Ratio Sensor | abnormal response characteristic |
| P1152 | O2 Sensor Circuit Range/Performance(Low) | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal voltage response |
| P1153 | O2 Sensor Circuit Range/Performance(High) | (Bank1 Sensor1) | Air/Fuel Ratio Sensor | abnormal voltage response |
| P1154 | O2 Sensor Circuit Range/ | Performance(Low) (Bank2 Sensor1) | Air/Fuel Ratio Sensor | abnormal voltage response |
| P1155 | 02 Sensor Circuit Range/Performance(High) | (Bank2 Sensor1 | Air/Fuel Ratio Sensor | abnormal voltage response |