Subaru Specific Trouble Codes

Check engine light p codes are coded according to the system they belong to. Generic codes start with P0. Manufacturer specific codes start with P1, but generally fall into the same guideline as below.

  • P0001 - P0099 - Fuel and Air Metering and Auxiliary Emission Controls
  • P0100 - P0199 - Fuel and Air Metering
  • P0200 - P0299 - Fuel and Air Metering (Injector Circuit)
  • P0300 - P0399 - Ignition System or Misfire
  • P0400 - P0499 - Auxiliary Emissions Controls
  • P0500 - P0599 - Vehicle Speed Controls and Idle Control System
  • P0600 - P0699 - Computer Output Circuit
  • P0700 - P0899 - Transmission

Subaru Trouble Codes 1000-1099

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)

Subaru Trouble Codes 1100-1199

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

Subaru Trouble Codes 1200-1299

P1230 Fuel pump control unit malfunction
P1244 Wastegate control solenoid valve malfunction (low input)
P1245 Wastegate control solenoid valve malfunction (fail-safe)

Subaru Trouble Codes 1300-1399

P1301 Fire due to increased exhaust temperature
P1312 Exhaust temperature sensor malfunction
P1325 Knock Sensor Circuit Low Input

Subaru Trouble Codes 1400-1499

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

Subaru Trouble Codes 1500-1599

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

Subaru Trouble Codes 1600-1699

P1698 Engine torque control cut signal circuit low input
P1699 Engine torque control cut signal circuit high input

Subaru Trouble Codes 1700-1799

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

1988 and later Multi-Point Fuel Injection (MPFI) Subaru Trouble Codes

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

1988 and later Subaru 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

1987 Fuel Injected Subaru Trouble Codes

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

1984 – 1986 Fuel Injected Subaru Trouble Codes

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

1983 – 1988 Carbureted Subaru Trouble Codes

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

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