P1133 Subaru Code - Front Oxygen Sensor Heater Circuit High Input
Quick Answer
P1133 Subaru indicates Front Oxygen Sensor Heater Circuit High Input. Common causes include Faulty Front Oxygen Sensor, Front Oxygen Sensor harness is open or shorted, Front Oxygen Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1133 Subaru indicates Front Oxygen Sensor Heater Circuit High Input.
- Common causes
- Common causes include Faulty Front Oxygen Sensor, Front Oxygen Sensor harness is open or shorted, Front Oxygen Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1133 Subaru Description
What are the Possible Causes of the DTC P1133 Subaru?
- Faulty Front Oxygen Sensor
- Front Oxygen Sensor harness is open or shorted
- Front Oxygen Sensor circuit poor electrical connection
How to Fix the DTC P1133 Subaru?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1133 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1133 Subaru Code
1. What does the OBDII code P1133 mean on a Subaru?
P1133 indicates a "Front Oxygen Sensor Heater Circuit High Input," meaning there is a problem with the heating element of the upstream oxygen sensor.
2. What are the symptoms of a P1133 code on a Subaru?
Common symptoms include a check engine light, poor fuel efficiency, rough idling, reduced engine performance, and difficulty passing emissions tests.
3. What causes the P1133 code on a Subaru?
The most common causes are a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, or an issue with the engine control module (ECM).
4. Can I drive my Subaru with a P1133 code?
While you can drive with this code, it’s not recommended because it may lead to poor fuel economy and long-term damage to the engine or catalytic converter.
5. How do I diagnose the P1133 code on my Subaru?
Start by inspecting the wiring and connectors for the front oxygen sensor, then test the heater circuit using a multimeter to check for proper resistance.
6. Does a P1133 code mean the oxygen sensor needs to be replaced?
Not always. While a faulty sensor is a common cause, the issue could also be with the wiring, connectors, or ECM. Proper diagnosis is essential.
7. How much does it cost to fix the P1133 code on a Subaru?
Replacing the oxygen sensor typically costs $150–$300, including parts and labor, but prices may vary depending on the model and location.
8. Can a dirty air filter cause the P1133 code?
No, a dirty air filter is not directly related to this code, as it specifically points to the oxygen sensor heater circuit.
9. How do I reset the P1133 code after repairs?
You can reset the code by using an OBDII scanner or by disconnecting the battery for 10–15 minutes, but only after ensuring the issue is fixed.
10. What happens if the P1133 code is ignored?
Ignoring the code can lead to worsened fuel economy, increased emissions, and potential damage to the catalytic converter over time.
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