AutoCodes – KIA – P0135 KIA

P0135 KIA Code - HO2S11 Heater Circuit

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 KIA indicates HO2S11 Heater Circuit.
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.

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Code Popularity 20,180

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0135 KIA Description

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. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
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.

OBDII Code P0135 KIA - HO2S11 Heater Circuit - AutoCodes.com — P0135 KIA Code - HO2S11 Heater Circuit

What does this mean?

What are the Possible Causes of the DTC P0135 KIA?

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 KIA?

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 does this mean?

Code Tech Notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. The code is triggered when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the sensor and connector are OK, replacing the O2 Sensor 1 usually takes care of the problem

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0135 KIA 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0135 KIA Code

1. What is OBDII code P0135 for a KIA, specifically HO2S11 Heater Circuit?

- This code indicates a malfunction in the upstream oxygen sensor's heater circuit in bank 1 sensor 1.

2. What are the common symptoms of a P0135 code in a KIA?

- Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the check engine light.

3. What are the possible causes of a P0135 error code in a KIA?

- The common causes include a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, blown heater circuit fuse, or an issue with the engine control module (ECM).

4. How can I diagnose a P0135 code in my KIA?

- You can diagnose this code using a scan tool to check for the specific error code, visually inspect the oxygen sensor and its wiring, test the heater circuit for continuity, and check the fuse related to the heater circuit.

5. Can I continue driving my KIA with a P0135 error code?

- It is not recommended to drive with a P0135 code as it can lead to decreased fuel efficiency, poor engine performance, and potential damage to other components.

6. How do I repair a P0135 error code in my KIA?

- Repair options include replacing the upstream oxygen sensor, repairing or replacing damaged wiring or connectors, checking and replacing the heater circuit fuse if necessary, and resetting the error code.

7. Is it possible to prevent a P0135 code from occurring in my KIA?

- Regular maintenance of the oxygen sensors and related components, avoiding driving with a misfiring engine, and promptly addressing any check engine light warnings can help prevent a P0135 code.

8. Can a DIY enthusiast fix a P0135 error code in a KIA?

- Depending on your skill level and access to tools, DIY enthusiasts can attempt to fix a P0135 code by following repair guides and using proper diagnostic equipment.

9. How much does it cost to repair a P0135 error code in a KIA?

- The cost of repairing a P0135 code can vary depending on the cause, but it typically ranges from $100 to $300 for parts and labor.

10. Will a P0135 error code affect my KIA's emissions or cause it to fail an emissions test?

- Yes, a P0135 code can affect your vehicle's emissions and may cause it to fail an emissions test due to improper oxygen sensor function impacting the air-fuel mixture.