P0135 Scion Code - Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1
Quick Answer
Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground. 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
- P0135 Scion indicates Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground.
- 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 P0135 Scion Description
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
What are the Possible Causes of the DTC P0135 Scion?
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0135 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0135 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.
Need more information about the P0135 Scion code?
Need more information on how to fix the P0135 Scion code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0135 Scion code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0135 Scion Code
1. What does the OBDII code P0135 mean for a Scion?
P0135 indicates a malfunction in the heater circuit of the oxygen sensor located on Bank 1, Sensor 1, which is responsible for warming the sensor to quickly reach operating temperature.
2. What are the common symptoms of the P0135 code in a Scion?
Symptoms may include the check engine light turning on, reduced fuel efficiency, and potentially a failed emissions test.
3. What causes the P0135 code to appear?
Common causes include a faulty oxygen sensor, blown fuse, damaged wiring or connectors in the heater circuit, or a malfunctioning engine control module (ECM).
4. How do I fix the P0135 code on my Scion?
Repairs may include replacing the oxygen sensor, fixing damaged wiring or connectors, checking and replacing blown fuses, and, in rare cases, reprogramming or replacing the ECM.
5. Can I drive my Scion with the P0135 code?
While the car is usually drivable, ignoring the issue can lead to poor fuel economy and increased emissions. It's best to address the problem promptly.
6. How do I diagnose the P0135 code on my Scion?
Use an OBDII scanner to confirm the code, inspect the oxygen sensor wiring and connectors, check for blown fuses, and test the heater circuit for continuity or voltage.
7. How much does it cost to repair the P0135 code in a Scion?
Repair costs vary, but replacing the oxygen sensor typically costs $150–$300, including parts and labor. Wiring or ECM repairs may cost more.
8. What is Bank 1, Sensor 1 in a Scion?
Bank 1 refers to the side of the engine with cylinder 1, and Sensor 1 is the upstream oxygen sensor located before the catalytic converter.
9. How can I prevent the P0135 code from recurring?
Regular maintenance, such as inspecting and replacing worn oxygen sensors and ensuring wiring is intact, can help prevent this code from appearing.
10. Will a faulty oxygen sensor affect my Scion’s performance?
Yes, a faulty oxygen sensor can cause poor engine performance, reduced fuel economy, and increased emissions.
Discuss the causes and fixes for P0135 Scion OBDII Code
Code P0135 Scion comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
