P0037 Scion Code - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
Quick Answer
The sensing portion of the heated oxygen sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0037 Scion indicates Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0037 Scion Description
The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions.
If the heater current is outside the normal range, the signal transmitted by the heated oxygen sensor becomes inaccurate. When the current in the heated oxygen sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a Diagnostic Trouble Code (DTC).
What are the Possible Causes of the DTC P0037 Scion?
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0037 Scion?
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 P0037 Scion 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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Information for Specific Scion Models
- P0037 2005 Scion xB — Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
- P0037 2006 Scion xB — Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
- P0037 2007 Scion xB — Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
Frequently Asked Questions about P0037 Scion Code
1. What does the OBDII code P0037 mean on a Scion?
P0037 indicates a problem with the Oxygen Sensor Heater Control Circuit Low for Bank 1 Sensor 2, meaning the heater circuit in the downstream oxygen sensor is not functioning properly.
2. What are the symptoms of code P0037 in a Scion?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, and possible difficulty passing emissions tests. In most cases, there are no noticeable drivability issues.
3. What causes the P0037 code to appear?
The most common causes include a faulty downstream oxygen sensor (Bank 1 Sensor 2), damaged wiring or connectors, a blown fuse, or a malfunctioning engine control module (ECM).
4. Can I drive my Scion with the P0037 code?
Yes, you can drive the vehicle, but it's not recommended to ignore the issue as it can affect fuel efficiency and emissions performance over time.
5. How do I diagnose the P0037 code on my Scion?
Check the oxygen sensor wiring and connectors for damage or corrosion, test the sensor's heater circuit with a multimeter, and inspect the associated fuse. Replace the sensor if it's faulty.
6. How much does it cost to fix the P0037 code?
Repair costs typically range from $100 to $300, depending on whether you replace the oxygen sensor yourself or have a mechanic do it.
7. Can a loose or damaged connector cause the P0037 code?
Yes, a loose or corroded connector can interrupt the heater circuit and trigger the P0037 code.
8. What tools are needed to fix the P0037 code on a Scion?
Common tools include an OBDII scanner, a multimeter for testing the circuit, and an oxygen sensor socket for replacing the sensor if necessary.
9. Does replacing the oxygen sensor always fix the P0037 code?
Not always. If the issue lies in the wiring, fuse, or ECM, replacing the sensor will not resolve the problem. Proper diagnosis is essential.
10. How can I prevent the P0037 code from recurring?
Regularly inspect and maintain the oxygen sensor wiring and connectors, and address any engine issues that could cause excessive stress on the sensor or heater circuit.
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