P0031 Code on a 2006 Subaru Legacy
The P0031 code on a 2006 Subaru Legacy refers to the HO2S11 (Heated Oxygen Sensor 1) Heater Control Circuit Low. This code is set when the Engine Control Module (ECM) detects an excessively low voltage through the heated oxygen sensor heater circuit.
Symptoms and Causes
– Symptoms: When the P0031 code is triggered, the Check Engine Light (CEL) will illuminate on the dashboard. This indicates a potential issue with the air/fuel sensor and/or its heater.
– Causes: The most common cause of the P0031 code is a bad oxygen sensor, although it can also be caused by wiring issues or a faulty ECM.
Repair and Diagnosis
– Diagnosis: To diagnose the P0031 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type.
– Repair: The repair for the P0031 code involves addressing the issue with the HO2S11 Heater Control Circuit Low. This may involve replacing the oxygen sensor or addressing any wiring issues.
It’s important to note that the P0031 code specifically relates to the HO2S11 (Bank 1 Sensor 1) in the exhaust system of the vehicle. It’s advisable to consult a professional mechanic or technician to accurately diagnose and address the issue.
If you have further questions or need additional information, feel free to ask!
Contents
- What is the code P0031 on a Subaru Legacy?
- Where is the oxygen sensor heater control circuit low bank 1 sensor 1?
- What does an air fuel sensor do?
- Where is oxygen sensor bank 1 located?
- What code does a bad O2 sensor give?
- Which O2 sensor is Bank 1 sensor?
- What is the code for the Subaru oxygen sensor?
- How do you test a Subaru oxygen sensor?
- What causes a P0031 code?
- What is the symptoms of a bad oxygen sensor?
What is the code P0031 on a Subaru Legacy?
Some possible causes of the P0031 include a faulty O2 sensor, issues with the O2 sensor heater circuit, and an outdated powertrain control module (PCM). An illuminated check engine light, poor engine performance, and excessive fuel consumption are some symptoms related to the P0031 code.
Where is the oxygen sensor heater control circuit low bank 1 sensor 1?
The P0030 triggers when your vehicle’s Engine Control Module (ECM) detects a fault in the heater circuit of the primary oxygen sensor on the bank 1 side of the engine. Cylinder number 1 sits on the bank 1 side of the engine, while sensor 1 is between the engine and the catalytic converter.
What does an air fuel sensor do?
The Air-Fuel Ratio (AFR) sensor, also known as an Oxygen Sensor (O2S), is a key component in modern combustion engines. It measures the oxygen content in the exhaust gases and provides feedback to the Engine Control Module (ECM) to adjust the fuel injection for optimal combustion.
Where is oxygen sensor bank 1 located?
Two. So basically this is bank one. This sounds the first one is sensor one the second one is sensor two. If you have a like a four cylinder. You don’t have two Banks you only have one Bank.
What code does a bad O2 sensor give?
6.0 COMMON OBDII CODES
| Code | Description | Location |
|---|---|---|
| P0154 | O2 Sensor Circuit No Activity Detected | Bank 2 Sensor 1 |
| P0155 | O2 Sensor Heater Circuit Malfunction | Bank 2 Sensor 1 |
| P0156 | O2 Sensor Circuit Sensor Malfunction | Bank 2 Sensor 2 |
| P0157 | O2 Sensor Circuit Low Voltage | Bank 2 Sensor 2 |
Which O2 sensor is Bank 1 sensor?
Bank 1 is the side with the #1 cylinder (Cylinders 1 – 3 – 5 – 7). Bank 2 is the side with the #2 cylinder (Cylinders 2 – 4 – 6 – 8). Sensor 1 = Before Catalytic converter Front (Upstream O2 sensor). Sensor 2 = After Catalytic Converter Rear (Downstream O2 sensor).
What is the code for the Subaru oxygen sensor?
The oxygen sensor measures the amount of oxygen in the exhaust stream and provides feedback to the engine control module (ECM) to adjust the fuel-air mixture. If it malfunctions, it can cause the ECM to misinterpret the data and potentially trigger the P0420 code.
How do you test a Subaru oxygen sensor?
Set your voltmeter to the millivolt DC setting. Connect your voltmeter to the oxygen sensor and read the voltage output. Oxygen sensors fluctuate from 100mV to around 900mV. Anything beyond this range is an indicator of a failed sensor.
What causes a P0031 code?
Po31 is a diagnostic trouble code for ho2s heater control circuit low at bank one sensor. One. Under this circumstance. Short distance driving is permitted.
What is the symptoms of a bad oxygen sensor?
Signs a Vehicle has a Bad O2 Sensor
- Check Engine Light Comes On.
- Noticeable Loss of Fuel Efficiency.
- Sulfur or ‘Rotten Egg’ smell from Exhaust.
- Black smoke from exhaust.
- Emission levels reach high levels.
- Your engine hesitates, skips, begins bucking or has power surges.
