How to Fix P1135 Lack of HO2S Switch – Adaptive Fuel at Limit

Introduction

If you’re experiencing a P1135 error code on your car, it means that there’s a problem with the HO2S (Heated Oxygen Sensor) switch. This sensor is responsible for monitoring the oxygen levels in the exhaust system and sending that information to the engine control module (ECM). When the ECM receives this information, it adjusts the fuel-to-air ratio to ensure optimal performance and fuel efficiency. However, if the HO2S switch is malfunctioning, the ECM won’t receive accurate information, leading to a P1135 error code. In this article, we’ll discuss how to fix this issue.

Step-by-Step Guide

Step 1: Check the HO2S Sensor

The first step in fixing a P1135 error code is to check the HO2S sensor. This sensor is located in the exhaust system, and it’s usually easy to access. Start by disconnecting the sensor from the wiring harness and using a multimeter to check its resistance. The resistance should be between 5 and 7 ohms. If the resistance is outside of this range, the sensor is faulty and needs to be replaced.

Step 2: Check the Wiring

If the HO2S sensor is working correctly, the next step is to check the wiring. Start by inspecting the wiring for any signs of damage or corrosion. If you notice any damage, repair or replace the wiring as necessary. Next, use a multimeter to check the continuity of the wiring. If there’s no continuity, the wiring is faulty and needs to be replaced.

Step 3: Check the ECM

If the HO2S sensor and wiring are both working correctly, the issue may be with the ECM. Start by checking the ECM for any signs of damage or corrosion. If you notice any damage, repair or replace the ECM as necessary. Next, use a diagnostic tool to check the ECM for any error codes. If there are any error codes related to the HO2S sensor, clear them and see if the P1135 error code returns.

Useful Tips

– Always disconnect the battery before working on any electrical components in your car.
– Use a diagnostic tool to check for any error codes before starting any repairs.
– If you’re not comfortable working on your car, take it to a professional mechanic.

Conclusion

Fixing a P1135 error code requires some basic knowledge of your car’s electrical system and a few tools. By following the steps outlined in this article, you should be able to diagnose and fix the issue. Remember to always take safety precautions when working on your car, and don’t hesitate to seek professional help if you’re not comfortable with the repairs.

FAQs

1. Can a faulty HO2S sensor cause other error codes?

Yes, a faulty HO2S sensor can cause other error codes related to the fuel-to-air ratio, such as P0171 and P0174.

2. How often should I replace my HO2S sensor?

HO2S sensors typically last between 60,000 and 100,000 miles. However, if you notice any issues with your car’s performance or fuel efficiency, it’s a good idea to have the sensor checked.

3. Can I drive my car with a P1135 error code?

While it’s possible to drive your car with a P1135 error code, it’s not recommended. This error code can cause issues with your car’s performance and fuel efficiency, and it may lead to other error codes if left unchecked. It’s best to have the issue fixed as soon as possible.