Engine-Codes - Lexus - P1135 LEXUS

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

- Code Popularity: 50,337 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the P1135 LEXUS Code?

  • 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 P1135 LEXUS Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P1135 LEXUS code tech notes





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|What is the cost to diagnose the P1135 LEXUS code?

Labor: 1.0

The cost to diagnose the P1135 LEXUS code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P1135 LEXUS code detected?

The P1135 is set when the Engine Control Module (ECM) detects a heated oxygen sensor heater circuit malfunction

|What are P1135 LEXUS code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P1135 LEXUS Code Mean?

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.

Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

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