P0030 on 2009-2018 Subaru Forester (Base, Premium, Limited, Touring, XT) — HO2S Heater Control Circuit (Bank 1 Sensor 1)
1 vehicles · 1 makes · $150-$450 repair
Most Reported On
P0030 is an OBD-II diagnostic trouble code meaning “HO2S Heater Control Circuit (Bank 1 Sensor 1).” The PCM detects a fault in the heater control circuit of the heated oxygen sensor (HO2S) at Bank 1, Sensor 1 (upstream). The internal heater that brings the sensor to operating temperature is not responding as expected. This code is most commonly reported on 2009-2018 Subaru Forester (Base, Premium, Limited, Touring, XT), with repair costs ranging from $150 to $450.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0030, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
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LAUNCH CRP123X OBD-II Scanner
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A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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- Oil reset, EPB, BMS, TPMS, injector coding
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FAQ
What does P0030 mean?
P0030 stands for "HO2S Heater Control Circuit (Bank 1 Sensor 1)." The PCM detects a fault in the heater control circuit of the heated oxygen sensor (HO2S) at Bank 1, Sensor 1 (upstream). The internal heater that brings the sensor to operating temperature is not responding as expected.
What are the most common causes of P0030?
The most common causes of P0030 are: Failed O2 sensor heater element, Blown fuse or open in heater circuit, Corroded/loose connector, PCM heater driver fault. The specific cause varies by vehicle.
How much does it cost to fix P0030?
Repair costs for P0030 range from $150 to $450, depending on the vehicle and root cause.
Which vehicles are affected by P0030?
Au7o has documented P0030 across 1 vehicle models from 1 manufacturers: Subaru.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.