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2004 Subaru Outback 2.5L MIL Lamp on
Posted to Asian Driveability on 1/9/2019 13 Replies

Hello. I got this 2004 Subaru that I can't seem to be able to get rid of the trouble code P0030 (Heater control circuit B1S1) upstream. I have replaced the O2 sensor twice with aftermarket sensors due to the price but something tells me it must be factory....

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car Vehicle Data

2004 Subaru Outback

VIN 4S3BH67504
Engine2.5 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / MFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursAlways

Trouble Codes

P0030Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Relay Circuit Malfunction
Open Help Request

car Vehicle Data

2004 Subaru Outback

VIN 4S3BH67504
Engine2.5 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / MFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursAlways

Trouble Codes

P0030Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Relay Circuit Malfunction