2022 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

Inspection Mode B

DTC Description & trouble part Condition Number of driving cycles on the detecting condition
P0087 FUEL RAIL/SYSTEM PRESSURE - TOO LOW BANK 1 Complete diagnosis with inspection mode A as well. 1
P0088 FUEL RAIL/SYSTEM PRESSURE - TOO HIGH BANK 1 Complete diagnosis with inspection mode A as well. 1
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 inspection mode A as well. 2
P0172 SYSTEM TOO RICH BANK 1 Complete diagnosis with inspection mode A as well. 2
P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED Complete diagnosis with inspection mode A as well. 2
P0301 CYLINDER 1 MISFIRE DETECTED Complete diagnosis with inspection mode A as well. 2
P0302 CYLINDER 2 MISFIRE DETECTED Complete diagnosis with inspection mode A as well. 2
P0303 CYLINDER 3 MISFIRE DETECTED Complete diagnosis with inspection mode A as well. 2
P0304 CYLINDER 4 MISFIRE DETECTED Complete diagnosis with inspection mode A as well. 2
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
P059F ACTIVE GRILLE AIR SHUTTER "A" PERFORMANCE/STUCK OFF [Ambient Temperature]: 3 - 33°C (37.4- 91.4°F) 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
P062D FUEL INJECTOR DRIVER CIRCUIT PERFORMANCE BANK 1 - 1
P0851 PARK/NEUTRAL SWITCH INPUT CIRCUIT LOW - 2
P0852 PARK/NEUTRAL SWITCH INPUT CIRCUIT HIGH - 2
P1261 CYLINDER 1 DIRECT FUEL INJECTOR CIRCUIT/OPEN - 1
P1262 CYLINDER 2 DIRECT FUEL INJECTOR CIRCUIT/OPEN - 1
P1263 CYLINDER 3 DIRECT FUEL INJECTOR CIRCUIT/OPEN - 1
P1264 CYLINDER 4 DIRECT FUEL INJECTOR CIRCUIT/OPEN - 1
P162A STARTER INTERLOCK INTERNAL CIRCUIT - 1
P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1 Complete diagnosis with inspection mode A as well. 2
P2097 POST CATALYST FUEL TRIM SYSTEM TOO RICH BANK 1 Complete diagnosis with inspection mode A as well. 2
WARNING: When performing inspection mode B on a public road, pay sufficient attention to the traffic condition and give the highest priority to safe driving.
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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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