2008 Subaru Outback Engine Sensor Diagram

There are self-diagnositic connectors on all models, when connected with the key ON (engine off), flash trouble codes on the LED light of the oxygen moniter of the ECU.

The connectors are under the steering wheel, to the left of the module on most models.
On carberated and SPFI injected 89 models,the test connectors are located on the engine side/driver's side of the firewall.
Imprenza models have the ECU and test connectors located behind the right side of the dash, instead of the left.
On SVX models the connectors are located behind the driver's side kick panel.

Test Modes

The codes are displayed as pulses of the LED mounted on the module. Long pulses (1.2 seconds) indicate tens and the short pulses (.2 seconds) indicate ones. Pulses are seperated by .3 second puses and codes are seperated by 1.8 second pauses. NOTE:on 89 MPFI models, the Oxygen Moniter light and ECU are mounted under the rear package shelf and are only accessible from the trunk. On some later models the Check engine lamp and O2 monitor lamp flash the code(s) corresponding to the faulty part. The long segment (1.2 sec on) indicates a "ten", and the short segment (0.2 sec on) signifies a "one".

90 models – Trouble codes on the Justy are viewed on the Oxygen Moniter light, all other models the codes can be viewed on either the Oxygen Moniter light or the MIL (check engine light).
95 Imprenza and Legacy models have OBD2 systems and require a scanner,but some basic codes can be retreived using the flashing MIL method.

Clearing Codes

Codes will only clear when the faulty system or circuit has been repaired. After making the repairs, codes can be cleared by connecting 2 pairs of connectors, the "Self-diagnostic" connectors and the "Read Memory" connectors that are usually to the right of the diagnostic connectors.

Start with a warmed up engine
Turn off the engine
Connect both pairs of connectors
Fianlly start the engine
This should clear the codes.

Trouble Codes

83 – 88 Subaru carb models
11	Ignition pulse system/crank angle sensor(87 & later)
12	Ignition pulse system (1983 only)/Starter switch (84 & later)
13	Crank angle sensor or circuit
14	Vacuum switches stay on or off (1983 only)/Duty solenoid or circuit(1983 to 1985)/Injectors 1 & 2 (87-up)
15	Solenoid valve stays on or off (1983 only)/Coasting Fuel Cut (CFC) system (1983 to 1985 )
16	Feedback system (1983 to 1985 models)
17	Fuel pump and automatic choke (1983 to 1985 carbureted)
21	Ignition pulse system (1983 only)/coolant temperature sensor or circuit (1983 to 1985 carbureted)
22	Ignition pulse system (1983 only)/Vehicle speed sensor or circuit or VLC solenoid valve or circuit. (1984 to 1988 carbureted)
23	Oxygen sensor or circuit (1983 to 1988)/pressure sensor or circuit (1983 to 1985)
24	Vacuum switches stay on or off (1983 only)/coolant temperature sensor or circuit, or Idle-up solenoid or circuit (1984 to 1988 carbureted)
25	Manifold vacuum sensor or circuit/coolant temperature sensor or circuit on 1984 models)/float chamber vent solenoid valve or circuit (1983 to 1985)
32	Coolant temperature sensor or circuit (1983)/Oxygen sensor or circuit (1984 to 1988)
33	Main system in feedback (1983 to 1988)/Vehicle speed sensor or circuit (1983 to 1985)
34	Choke power stays on or off (1983)/EGR system solenoid or circuit (1883 to 1988)
35	Canister purge solenoid or circuit (1983 to 1985)
41	Vacuum switches stay on or off (1983 only)/Feedback system (California models 1983 to 1985)
42	Vacuum switches stay on or off (1983 only)/clutch switch or circuit (1983 to 1988)
43	Choke power stays on or off (1983)
46	Radiator fan control (1983 to 1985)
52	Solenoid valve control system or clutch switch
53	Fuel pump circuit or Altitude compensator switch
54	Choke control system
55	Upshift control or EGR sensor
56	EGR system
62	Exhaust Gas Recirculation (EGR) solenoid valve control or Idle-up system
63	Canister solenoid valve or circuit/Idle-up system
64	Vacuum line control valve or circuit
65	Float chamber vent control valve circuit
71	Ignition pulse system
73	Ignition pulse system
74	Ignition pulse system

84 – 86 Fuel Injected models
11	Ignition pulse
12	Starter switch off
13	Starter switch on
14	Airflow meter or circuit
15	Atmospheric pressure switch – fixed value
16	Crank angle sensor or circuit
17	Starter switch or circuit
21	Seized airflow meter flap
22	Pressure or vacuum switches – fixed value
23	Idle switch – fixed value
24	Wide open throttle switch – fixed value
25	Throttle sensor idle switch or circuit
31	Speed sensor or circuit
32	Oxygen sensor or circuit
33	Coolant sensor or circuit
34	Abnormal aspirated air thermosensor
35	Air flow meter/EGR solenoid switch or circuit
41	Atmospheric pressure sensor or circuit
42	Fuel injector – fixed value
43	KDLH control system
46	Neutral or parking switch or circuit
47	Fuel injector
53	Fuel pump or circuit
55	KDLH control system
57	Canister control system
58	Air control system
62	EGR control system
88	TBI control unit

87 Fuel Injected models
11	Ignition pulse/crank angle sensor
12	Starter switch or circuit
13	Crank angle sensor or circuit
14	Injectors 1 and 2
15	Injectors 3 and 4
21	Coolant temperature sensor or circuit
22	Knock sensor or circuit
23	Air flow meter or circuit
24	Air control
31	Throttle sensor or circuit
32	Oxygen sensor or circuit
33	Vehicle Speed Sensor (VSS) or circuit
34	EGR solenoid valve stuck on or off
35	Purge control solenoid or circuit
41	Lean fuel mixture indicated
42	Idle switch or circuit
45	Kick-down relay or circuit
51	Neutral switch or curcuit
61	Parking switch or circuit

88 and later models with Single-Point Fuel Injection
11	Crank angle sensor or circuit
12	Starter switch or circuit
13	Crank angle sensor or circuit
14	Fuel injector – abnormal output
21	Coolant temperature or circuit
23	Air flow meter or circuit
24	Air control valve or circuit
31	Throttle sensor or circuit
32	Oxygen sensor or circuit
33	Vehicle Speed Sensor or circuit
34	EGR solenoid or circuit
35	Purge control solenoid or circuit
42	Idle switch or circuit
45	Kick-down control relay or circuit
51	Neutral switch continuously in the on position
55	EGR temperature sensor or circuit
61	Parking switch or circuit

1988 and later models with Multi-Point Fuel Injection (including Legacy)
11	Crank angle sensor or circuit
12	Starter switch or circuit
13	Cam position sensor or circuit (TDC sensor on Justy)
14	Fuel injector no. 1 (Legacy, Impreza, Justy, SVX); Fuel injector 1 and 2 (XT, Loyale, GL, DL)
15	Fuel injector no. 2 (Legacy, Impreza, Justy, SVX); Fuel injector 3 and 4 (Loyale, GL, DL); Fuel injector 5 and 6 (XT6)
16	Fuel injector no. 3 (Legacy, Impreza, Justy, SVX); Fuel injector 3 and 4 (XT)
17	Fuel injector no. 4 (Legacy, Impreza, SVX); Fuel injector 1 and 2 (XT6)
18	Fuel injector no. 5 (SVX)
19	Fuel injector no. 6 (SVX)
21	Coolant temperature sensor or circuit
22	Knock sensor or circuit (right side on SVX)
23	Air flow meter or circuit (exc. Justy); Pressure sensor (Justy)
24	Air control valve or circuit (exc. Justy); Idle speed control solenoid valve (Justy)
25	Fuel Injector 3 and 4 (XT6)
26	Air temperature sensor (Justy)
28	Knock sensor no. 2 (SVX, left side)
29	Crank angle sensor (SVX, no. 2)
31	Throttle position sensor or circuit
32	Oxygen sensor or circuit (no. 1, right side on SVX)
33	Vehicle speed sensor (VSS) or circuit
34	EGR solenoid valve
35	Canister purge solenoid or circuit
36	Air suction solenoid valve (Impreza); Igniter circuit (Justy)
37	Oxygen sensor (no. 2, left side , SVX)
38	Engine torque control (SVX)
41	Air/fuel adaptive control
42	Idle switch or circuit
43	Throttle switch (Justy)
44	Wastegate duty solenoid (turbo)
45	Pressure duty solenoid (turbo)/atmospheric pressure sensor circuit (non-turbo)
49	Airflow sensor
51	Neutral switch (manual transmission)/inhibitor switch (automatic transmission)
52	Parking brake switch (exc. Justy)/Clutch switch (Justy)
55	EGR temperature sensor
56	EGR system
61	Parking brake switch (Loyale)/Fuel tank pressure control solenoid valve (Impreza)
62	Fuel temperature sensor (Impreza)/Electric load signal (Justy)
63	Fuel tank pressure sensor (Impreza)/Blower fan switch (Justy)
65	Vacuum pressure sensor

Subaru OBD2 Codes
P0031	Front oxygen (A/F) sensor heater circuit low input
P0032	Front oxygen (A/F) sensor heater circuit high input
P0037	Rear oxygen sensor heater circuit malfunction
P0038	Rear oxygen sensor heater circuit high input
P0065	Air assist injector solenoid valve malfunction
P0066	Air assist injector solenoid valve circuit low input
P0067	Air assist injector solenoid valve circuit high input
P0100	Mass Air Flow Sensor Circuit Malfunction
P0101	Mass Air Flow Sensor Circuit Range Problem
P0102	Mass Air Flow Sensor Circuit Low Input
PO103	Mass Air Flow Sensor Circuit High Input
P0105	Pressure Sensor Circuit Malfunction
P0106	Pressure Sensor Circuit Range Problem
PO107	Pressure Sensor Circuit Low Input
PO108	Pressure Sensor Circuit High Input
P0111	Intake air temperature sensor circuit range/performance problem
P0112	Intake air temperature sensor circuit low input
P0113	Intake air temperature sensor circuit high input
P0115	Engine Coolant Temperature Sensor Circuit
P0116	Engine Coolant Temp Sensor Circuit Low Input
PO117	Engine Coolant Temp Sensor Circuit Low Input
PO118	Engine Coolant Temp Sensor Circuit High Input
P0120	Throttle Position Sensor Circuit Malfunction
P0121	Throttle Position Sensor Circuit Range Problem
PO122	Throttle Position Sensor Circuit Range Problem
PO123	Throttle Position Sensor Circuit High Input
P0125	Insufficient Coolant Temperature for Closed Loop
P0128	Thermostat malfunction
P0130	Front Oxygen Sensor Circuit Malfunction
P0131	Front oxygen (A/F) sensor circuit range/performance problem (low input)
P0132	Front oxygen (A/F) sensor circuit range/performance problem (high input)
P0133	Front Oxygen Sensor Circuit Slow Response
P0135	Front Oxygen Sensor Heater Circuit Malfunction
P0136	Rear Oxygen Sensor Circuit Malfunction
P0139	Rear Oxygen Sensor Circuit Slow Response
P0141	Rear Oxygen Sensor Heater Circuit Malfunction
P0170	Fuel Trim Malfunction
P0171	Fuel trim malfunction (A/F too lean)
P0172	Fuel trim malfunction (A/F too rich)
PO181	Fuel Temperature Sensor A Range Problem
PO182	Fuel Temperature Sensor A Circuit Low Input
PO183	Fuel Temperature Sensor A Circuit High Input
P0201	Fuel Injector Circuit Malfunction – #1
P0202	Fuel Injector Circuit Malfunction – #2
P0203	Fuel Injector Circuit Malfunction – #3
P0204	Fuel Injector Circuit Malfunction – #4
P0244	Wastegate control solenoid valve malfunction (high input)
P0245	Wastegate control solenoid valve circuit low input
P0246	Wastegate control solenoid valve circuit high input
PO261	Fuel Injector Circuit Low Input – #1
PO262	Fuel Injector Circuit High Input – #1
PO264	Fuel Injector Circuit Low Input – #2
PO265	Fuel Injector Circuit High Input – #2
PO267	Fuel Injector Circuit Low Input – #3
PO268	Fuel Injector Circuit High Input – #3
PO270	Fuel Injector Circuit Low Input – #4
PO271	Fuel Injector Circuit High Input – #4
P0301	Cylinder 1 Misfire Detected
P0302	Cylinder 2 Misfire Detected
P0303	Cylinder 3 Misfire Detected
P0304	Cylinder 4 Misfire Detected
P0325	Knock Sensor Circuit Malfunction
P0327	Knock sensor circuit low input
P0328	Knock sensor circuit high input
P0335	Crankshaft Position Sensor Circuit Malfunction
PO336	Crankshaft Position Sensor Circuit Range Problem
P0340	Camshaft Position Sensor Circuit Malfunction
PO341	Camshaft Position Sensor Circuit Range Problem
P0400	Exhaust Gas Recirculation Flow Malfunction
P0403	Exhaust Gas Recirculation Circuit Malfunction
PO420	Catalyst System Efficiency Below Threshold
PO440	Evaporative Emission Control System Malfunction
P0441	Evap System Incorrect Purge Flow
P0442	Evaporative emission control system malfunction
P0443	Evap System Purge Control Valve Circuit
PO443	EVAP System Purge Control Valve Circuit Low Input
P0444	Evaporative emission control system purge control valve circuit low input
P0445	Evaporative emission control system purge control valve circuit high input
PO446	EVAP System Vent Control Low Input
P0447	Evaporative emission control system vent control low input
P0448	Evaporative emission control system vent control high input
PO451	EVAP Pressure Sensor Range Problem
PO452	EVAP Pressure Sensor Low Input
PO453	EVAP Pressure Sensor High Input
P0456	Evaporative emission control system malfunction
PO461	Fuel Level Sensor Circuit Range/Performance Problem
PO462	Fuel Level Sensor Circuit Low Input
PO463	Fuel Level Sensor Circuit High Input
P0464	Fuel level sensor intermittent input
P0480	Cooling Fan Relay 1 Circuit Low Input
P0483	Cooling Fan Function Problem
P0500	Vehicle Speed Sensor Malfunction
P0505	Idle Control System Malfunction
P0506	Idle Control System RPM Lower Than Expected
P0507	Idle Control System RPM Higher Than Expected
P0509	Idle control system circuit high input
P0512	Starter switch circuit high input
P0545	Exhaust gas temperature sensor circuit low input
P0546	Exhaust gas temperature sensor circuit high input
P0600	Serial Communication Link Malfunction
P0601	Internal Control Module Memory Checksum Error
P0604	Internal control module memory check sum error
P0703	Brake Switch Input Malfunction
P0705	Transmission Range Sensor Circuit Malfunction
P0710	Transmission Fluid Temperature Sensor Circuit
P0715	Torque Converter Turbine Speed Sensor Circuit Malfunction
P0720	Output Speed Sensor Circuit Malfunction
P0725	Engine Speed Input Circuit Malfunction
P0731	Gear 1 Incorrect Ratio
P0732	Gear 2 Incorrect Ratio
P0733	Gear 3 Incorrect Ratio
P0734	Gear 4 Incorrect Ratio
P0740	Torque Converter Clutch System Malfunction
P0741	Torque converter clutch system malfunction
P0743	Torque Converter Clutch System Electrical
P0748	Pressure Control Solenoid Electrical
P0753	Shift Solenoid A Electrical
P0758	Shift Solenoid B Electrical
P0760	Shift Solenoid C Malfunction
P0763	Shift Solenoid C Electrical
P0778	2-4 brake pressure control solenoid valve (2-4 brake duty solenoid) circuit malfunction
P0785	2-4 brake timing control solenoid valve (2-4 brake timing solenoid) circuit malfunction
P1086	Tumble generator valve #2 (LH) position sensor circuit low input
P1087	Tumble generator valve #2 (LH) position sensor circuit high input
P1088	Tumble generator valve #1 (RH) position sensor circuit low input
P1089	Tumble generator valve #1 (RH) position sensor circuit high input
P1090	Tumble generator valve #1 (RH) malfunction (stuck open)
P1091	Tumble generator valve #1 (RH) malfunction (stuck close)
P1092	Tumble generator valve #2 (LH) malfunction (stuck open)
P1093	Tumble generator valve #2 (LH) malfunction (stuck close)
P1094	Tumble generator valve circuit #1 (open circuit)
P1095	Tumble generator valve circuit #1 (over current)
P1096	Tumble generator valve circuit #2 (open circuit)
P1097	Tumble generator valve circuit #2 (over current)
P1100	Starter Switch Circuit Malfunction
P1101	Neutral Position Switch Circuit High Input (A/T)
P1101	Neutral Position Switch Circuit Malfunction (M/T)
P1102	Pressure Sources Solenoid Valve Circuit Malfunction
P1103	Pressure Sources Switching Solenoid Valve Circuit
P1104	Engine Torque Control Signal Circuit Malfunction
P1106	Engine Torque Control Signal 2 Circuit Malfunction
P1110	Atmospheric pressure sensor low input
P1111	Atmospheric pressure sensor high input
P1112	Atmospheric pressure sensor range/performance problem
P1115	Engine Torque Control Cut Signal Circuit High Input
P1116	Engine Torque Control Cut Signal Circuit Low Input
P1120	Starter Switch High Input
P1121	Neutral Position Switch Circuit High Input [MT Vehicles]
P1121	Neutral Position Switch Circuit Low Input [AT Vehicles]
P1122	Pressure Sources Switching Valve Circuit High Input
P1124	TCS Signal Circuit High Input
P1130	Front oxygen sensor circuit malfunction (open circuit)
P1131	Front oxygen sensor circuit malfunction (short circuit)
P1134	Front oxygen (A/F) sensor microcomputer problem
P1137	Front oxygen (A/F) sensor circuit range/performance problem
P1139	Front oxygen (A/F) sensor #1 heater circuit performance/range problem
P1141	Mass Air Flow Sensor Circuit High Input
P1142	Mass Air Flow Sensor Circuit Low Input
P1143	Pressure Sensor Circuit Low Input
P1144	Pressure Sensor Circuit High Input
P1146	Pressure sensor circuit range/performance problem (high input)
P1150	Front Oxygen Sensor Heater Circuit High Input
P1151	Rear Oxygen Sensor Heater Circuit High Input
P1230	Fuel pump control unit malfunction
P1244	Wastegate control solenoid valve malfunction (low input)
P1245	Wastegate control solenoid valve malfunction (fail-safe)
P1301	Fire due to increased exhaust temperature
P1312	Exhaust temperature sensor malfunction
P1325	Knock Sensor Circuit Low Input
P1400	Fuel Tank Pressure Control Solenoid Low Input
P1420	Fuel Tank Pressure Control Solenoid High Input
P1421	Exhaust Gas Recirculation Circuit High Input
P1422	EVAP Purge Control Valve Circuit High Input
P1423	EVAP Vent Control High Input
P1440	Fuel Tank Pressure Control System Low Input
P1441	Fuel Tank Pressure Control System High Input
P1442	Fuel Level Sensor Circuit Range/Perf

P1443	EVAP Control System Vent Control Function Problem
P1480	Cooling fan relay 1 circuit high input
P1500	Radiator Fan Relay 1 Circuit Malfunction
P1501	Idle Control System Malfunction (Fail Safe)
P1502	Radiator Fan Function Problem
P1507	Idle Control System Malfunction (Fail Safe)
P1510	Idle Air Control Solenoid Signal 1 Circuit Low Input
P1511	Idle Air Control Solenoid Signal 1 Circuit High Input
P1512	Idle Air Control Solenoid Signal 2 Circuit Low Input
P1513	Idle Air Control Solenoid Signal 2 Circuit High Input
P1514	Idle Air Control Solenoid Signal 3 Circuit Low Input
P1515	Idle Air Control Solenoid Signal 3 Circuit High Input
P1516	Idle Air Control Solenoid Signal 4 Circuit Low Input
P1517	Idle Air Control Solenoid Signal 4 Circuit High Input
P1518	Starter switch circuit low input
P1520	Radiator Fan Relay 1 Circuit High Input
P1540	Vehicle Speed Sensor Malfunction 2
P1544	High exhaust temperature detected
P1560	Back-Up Voltage Circuit Malfunction
P1590	Neutral position switch circuit high input
P1591	Neutral position switch circuit low input
P1592	Neutral position switch circuit (MT model)
P1594	Automatic transmission diagnosis input signal circuit malfunction
P1595	Automatic transmission diagnosis input signal circuit low input
P1596	Automatic transmission diagnosis input signal circuit high input
P1698	Engine torque control cut signal circuit low input
P1699	Engine torque control cut signal circuit high input
P1700	Throttle Position Sensor Circuit Malfunction (A/T)
P1701	Cruise Control Set Signal Circuit Malfunction (A/T)
P1702	Auto Trans Diagnosis Input Signal Circuit
P1703	Low clutch timing control solenoid valve circuit malfunction
P1704	2-4 Brake Timing Solenoid Valve Circuit Malfunction
P1705	2-4 Brake Pressure Solenoid Valve (Solenoid D) Circuit
P1711	Engine torque control signal 1 circuit malfunction
P1712	Engine torque control signal 2 circuit malfunction
P1722	Auto Trans Diagnosis Input Signal High Input
P1742	Auto Trans Diagnosis Input Signal Malfunction