P0135 Audi Code - HO2S11 Sensor 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 Audi indicates HO2S11 Sensor 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.
Code P0135 Audi 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 Audi?
- 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 Audi?
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 Audi 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 Audi Code
1. What does the OBDII code P0135 for Audi indicate?
The code P0135 for Audi indicates an issue with the HO2S11 (Heated Oxygen Sensor 1, Bank 1) sensor heater circuit.
2. What are the common symptoms of a HO2S11 sensor heater circuit malfunction?
Common symptoms of a HO2S11 sensor heater circuit malfunction include poor fuel economy, rough idling, engine misfires, and an illuminated check engine light.
3. What are the possible causes of the P0135 code in an Audi?
Possible causes of the P0135 code in an Audi include a faulty HO2S11 sensor, a damaged sensor wiring harness, a blown fuse, or a problem with the sensor's heater circuit.
4. How can I diagnose a HO2S11 sensor heater circuit issue in my Audi?
Diagnosing a HO2S11 sensor heater circuit issue in your Audi involves checking the sensor wiring, testing the sensor heater circuit resistance, and verifying proper power supply to the sensor.
5. Can I drive my Audi with the P0135 code present?
It is not recommended to drive your Audi with the P0135 code present, as it can lead to poor engine performance and potential damage to the catalytic converter.
6. How can I repair a HO2S11 sensor heater circuit problem in my Audi?
To repair a HO2S11 sensor heater circuit problem in your Audi, you may need to replace the faulty oxygen sensor, repair or replace the wiring harness, or address any issues with the sensor's heater circuit.
7. Is it possible to clear the P0135 code in my Audi without fixing the issue?
Clearing the P0135 code without fixing the underlying issue will only temporarily turn off the check engine light, but the problem will persist and may lead to further issues down the line.
8. How much does it typically cost to repair a HO2S11 sensor heater circuit problem in an Audi?
The cost of repairing a HO2S11 sensor heater circuit problem in an Audi can vary depending on the exact cause of the issue, but it may range from $150 to $400 for parts and labor.
9. Can a DIY enthusiast replace the HO2S11 sensor in an Audi?
While replacing the HO2S11 sensor in an Audi is technically possible for a DIY enthusiast, it is recommended to have the job done by a professional to ensure proper installation and functioning.
10. How often should the oxygen sensors be checked in an Audi to prevent P0135 code issues?
It is recommended to have the oxygen sensors checked during routine maintenance or whenever you experience symptoms of a potential issue to prevent the occurrence of the P0135 code in your Audi.
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