2019 Subaru Outback 2.5iFACTORY OEM SERVICE PROCEDURE

Drive Cycle B

DTC Item Condition Number of driving cycles on the detecting condition
P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL «Coolant Temp.» at engine start: Less than -15°C (5°F) 2
P0134 A/F/O2 SENSOR CIRCUIT NO ACTIVITY DETECTED BANK 1 SENSOR 1 - 1
P0137 O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 2 - 2
P0138 O2 SENSOR CIRCUIT HIGH VOLTAGE BANK 1 SENSOR 2 - 2
P0140 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED BANK 1 SENSOR 2 - 2
P0171 SYSTEM TOO LEAN BANK 1 Complete diagnosis with drive cycle A as well. 2
P0172 SYSTEM TOO RICH BANK 1 Complete diagnosis with drive cycle A as well. 2
P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED Complete diagnosis with drive cycle A as well. 1
P0301 CYLINDER 1 MISFIRE DETECTED Complete diagnosis with drive cycle A as well. 1
P0302 CYLINDER 2 MISFIRE DETECTED Complete diagnosis with drive cycle A as well. 1
P0303 CYLINDER 3 MISFIRE DETECTED Complete diagnosis with drive cycle A as well. 1
P0304 CYLINDER 4 MISFIRE DETECTED Complete diagnosis with drive cycle A as well. 1
P0500 VEHICLE SPEED SENSOR "A" CIRCUIT - 1
P0506 IDLE CONTROL SYSTEM RPM - LOWER THAN EXPECTED   2
P0507 IDLE CONTROL SYSTEM RPM - HIGHER THAN EXPECTED   2
P059A ACTIVE GRILLE AIR SHUTTER "A" POSITION SENSOR CIRCUIT «Ambient Temperature »: 3 - 33°C (37.4 - 91.4°F) 1
P059F ACTIVE GRILLE AIR SHUTTER "A" PERFORMANCE/STUCK OFF 2
P05A0 ACTIVE GRILLE AIR SHUTTER "A" STUCK ON 2
P05A1 ACTIVE GRILLE AIR SHUTTER "A" POSITION SENSOR MINIMUM/MAXIMUM STOP PERFORMANCE 2
P05A2 ACTIVE GRILLE AIR SHUTTER "A" CONTROL CIRCUIT/OPEN 1
P05A6 ACTIVE GRILLE AIR SHUTTER "A" SUPPLY VOLTAGE CIRCUIT/OPEN - 1
P05C0 ACTIVE GRILLE AIR SHUTTER MODULE "A" OVER TEMPERATURE 1
P0851 PARK/NEUTRAL SWITCH INPUT CIRCUIT LOW - 2
P0852 PARK/NEUTRAL SWITCH INPUT CIRCUIT HIGH - 2
P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1 Complete diagnosis with drive cycle A as well. 2
P2097 POST CATALYST FUEL TRIM SYSTEM TOO RICH BANK 1 Complete diagnosis with drive cycle A as well. 2

Diagnostic procedure: 

  1. Drive at 10 km/h (6 MPH) or more.
  2. Stop the vehicle and idle for ten minutes.
  3. Read the temporary code using the Subaru Select Monitor or general scan tool. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>READ DIAGNOSTIC TROUBLE CODE (DTC)>OPERATION .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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