P0135 Toyota RAV4 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 Toyota RAV4 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 Toyota RAV4 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 Toyota RAV4?
- 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 Toyota RAV4?
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 Toyota RAV4 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 P0135 Toyota RAV4 Code
What does the OBDII code P0135 mean on a Toyota RAV4?
The P0135 code indicates a malfunction in the heater circuit of the heated oxygen sensor (Bank 1 Sensor 1), which affects its ability to reach operating temperature efficiently.
What are the symptoms of code P0135 on a Toyota RAV4?
Common symptoms include poor fuel economy, increased emissions, a rough idle, and the check engine light turning on.
What causes the P0135 code to appear on a Toyota RAV4?
Typical causes include a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, or issues with the PCM (powertrain control module).
Can I drive my Toyota RAV4 with the P0135 code?
While the vehicle may still be drivable, ignoring the code can lead to reduced fuel efficiency and potential damage to the catalytic converter over time.
How do I fix the P0135 code on a Toyota RAV4?
Repairs typically involve inspecting and replacing the heated oxygen sensor (Bank 1 Sensor 1), repairing damaged wiring or connectors, or addressing any PCM-related issues.
How do I know if the oxygen sensor is faulty for code P0135?
You can test the sensor with a multimeter to check if the heater circuit is functioning properly or have a mechanic perform a diagnostic test.
Where is Bank 1 Sensor 1 located on a Toyota RAV4?
Bank 1 Sensor 1 is located in the exhaust system before the catalytic converter on the side of the engine with cylinder 1.
What tools are needed to fix a P0135 code on a Toyota RAV4?
Common tools include an OBDII scanner, a multimeter for testing circuits, and a wrench or socket set to remove the oxygen sensor.
Can a bad oxygen sensor cause other problems if not fixed?
Yes, a faulty oxygen sensor can lead to poor engine performance, increased emissions, and potential damage to the catalytic converter.
How much does it cost to repair the P0135 code on a Toyota RAV4?
Replacing the oxygen sensor typically costs between $150 and $300, depending on parts and labor rates in your area.
Discuss the causes and fixes for P0135 Toyota RAV4 OBDII Code
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