AutoCodes – Generic – P1135

P1135 Code - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Quick Answer

Air-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. Common causes include Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open or shorted, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1135 indicates Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
Common causes: Common causes include Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open or shorted, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 30,591

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 29, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1135 Description

Air-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. The faster the air-fuel ratio 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 air-fuel ratio sensor. The ECM controls the air-fuel ratio 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 P1135 - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1 - AutoCodes.com — P1135 Code - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P1135?

Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1
Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open or shorted
Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1135?

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 P1135 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 P1135 code?

Need more information on how to fix the P1135 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1135 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1135 Audi — HO2S Heater Circuit- Bank 1 & 2 Sensor 2 Electrical Malfunction
P1135 BMW — O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 1
P1135 Buick — HO2S Lean Average Bank 1 Sensor 1
P1135 Cadillac — HO2S Lean Average Bank 1 Sensor 1
P1135 Chevrolet — HO2S Lean Mean Bank 1 Sensor 1
P1135 Chrysler — Glow Plug Control Module Voltage Supply Concern
P1135 Dodge — Glow Plug Control Module Voltage Supply Concern
P1135 Ford — Pedal Position Sensor 'A' Circuit Intermittent
P1135 GMC — HO2S Lean Mean Bank 1 Sensor 1
P1135 Hyundai — Injection Timing Servo
P1135 Infiniti — Intake Valve Timing Control Bank 2
P1135 Lexus — Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1
P1135 MINI — O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 1
P1135 Nissan — Intake Valve Timing Control Bank 2
P1135 Scion — Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1
P1135 Subaru — Front Left Oxygen Sensor Circuit Open
P1135 Toyota — Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1
P1135 Volkswagen — HO2S Heater Circuit- Bank 1 & 2 Sensor 2 Electrical Malfunction

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 P1135 Code

1. What are the common symptoms of OBDII code P1135?

- Common symptoms include poor fuel economy, engine misfires, rough idling, and decreased overall engine performance.

2. What are the possible causes of code P1135?

- The code P1135 can be caused by a faulty air/fuel ratio sensor, damaged wiring or connectors, a blown fuse, or a problem with the engine control module (ECM).

3. How can I diagnose the cause of code P1135?

- To diagnose the cause of code P1135, you can use a scan tool to check for any additional codes, visually inspect the sensor and its connections for damage, and test the sensor's resistance with a multimeter.

4. Can I drive my vehicle with OBDII code P1135?

- It is not recommended to drive your vehicle with code P1135 as it can lead to poor engine performance and potential damage to other components in the long run.

5. How can I repair OBDII code P1135?

- Repairing code P1135 often involves replacing the air/fuel ratio sensor, checking and repairing any damaged wiring or connectors, and resetting the ECM to clear the code.

6. Is it safe to ignore OBDII code P1135?

- Ignoring code P1135 can lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter. It is best to address the issue promptly.

7. Can a DIY enthusiast fix OBDII code P1135?

- While some DIY enthusiasts may be able to diagnose and replace the air/fuel ratio sensor, it is recommended to have a professional mechanic perform the repair to ensure proper installation and prevent further issues.

8. How much does it cost to repair OBDII code P1135?

- The cost of repairing code P1135 can vary depending on the make and model of your vehicle, the cost of the replacement parts, and the labor rates of the repair shop. It is best to get a few quotes from different shops.

9. Will resetting the ECM clear OBDII code P1135?

- Resetting the ECM may temporarily clear the code, but if the underlying issue causing code P1135 is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the problem.

10. How often does OBDII code P1135 occur in vehicles?

- OBDII code P1135, indicating an air/fuel ratio sensor heater circuit malfunction, is a relatively common issue in vehicles equipped with this sensor.