Honda P0135 Error Code Meaning, Top Causes and Solutions

Honda P0135 error code indicates an issue with the heating element of your car’s oxygen sensor. This sensor monitors the level of oxygen in exhaust gases. It then sends this information to the engine control module.

Honda P0135 Error Code Meaning ~ Ran When Parked

In this post, you will learn what this trouble code in Honda means as well as the top causes and solutions.

What Is Triggering Honda P0135 Trouble Code in Your Car?

The trigger for the Honda p0135 error code in your car is a faulty oxygen sensor heater. For the proper functioning of the oxygen sensor, it has to be warm. However, if the oxygen sensor heater is faulty, then it will trigger the P0135 code in your car.

Your car’s heated oxygen sensor or air/fuel ratio sensor is in the exhaust manifold. Its role is to measure oxygen in the exhaust gas and send this information to the engine control module (ECM).

The ECM monitors the time it takes the sensor to warm up and begin sending valid signals. Once the sensor takes long to warm up, the ECM will trigger the P0135 error code.

In addition, your Honda’s faulty oxygen sensor heater will trigger this error because it affects the performance and accuracy of the sensor. The sensor needs to reach its optimal temperature to start sending reliable information. This is where the heater element in the sensor comes in to warm it faster and maintain a stable temperature.

However, with time the heater element may malfunction. When this happens, then it is unable to heat the sensor as quickly or sufficiently. This will cause the sensor to send erratic signals that do not indicate the amount of oxygen in the exhaust.

Eventually, the ECM will detect the discrepancy which will then trigger the code p0135 to warn you that the sensor is taking too long to warm up.

Blown or Missing Fuse for the Sensor Heater Triggers P0135

Another reason your Honda vehicle triggers the P0135 error code is because of a blown or missing fuse for the sensor heater. The heater element heats up when current flows through it. To protect it, it is connected to a fuse and a relay that protects it from overloading.

Your car’s ECM will activate the relay when the engine is cold or running at a low speed. At the same time, the ECM will deactivate it when it is warm or running at a high speed. However, If the fuse is blown or missing, the current will not flow to the heater element.

What Is Triggering Honda P0135 Trouble Code in Car ~ Ran When Parked

As a result, the sensor will not warm up properly. Eventually, the ECM will detect the sensor is taking too long to warm up triggering the code in question.

One of the common mistakes is confusing P0135 honda civic bank 1 sensor 1 with Honda P0141. Both error codes arise from issues with the heated oxygen sensor. However, the P0141 error indicates the issue is in sensor 2 in bank 1. On the other hand, the P0135 Honda location of the error is sensor 1 in bank 1.

There are a number of factors that contribute to the blowing of the sensor fuse. The most common cause is a short circuit between the fuse box and the sensor. Other causes are voltage surges and physical damage or corrosion.

Damaged Wiring Between the Sensor and the ECM or Fuse

Another trigger for this error code is faulty wiring between your car’s sensor and the ECM or fuse box. This will happen because faulty wiring between these components interferes with the flow of current to the heater element in the sensor. As a result, the ECM can interpret this as a heater circuit malfunction triggering the error code.

Also, faulty wiring between the sensor and ECM interferes with signals sent from the sensor to the ECM. Once it happens, it becomes impossible for the ECM to monitor. This includes establishing the time it takes for the sensor to warm up. As a result, the ECM will trigger the P0135 code.

If your Honda Fit has a wiring harness issue between the sensor and the ECM, it will trigger a P0135 Honda Fit error.

At this point, it is worth keeping in mind that this engine code is not just for Honda. Other vehicle makers such as Toyota will trigger P0135 Toyota error code if your Toyota car has an issue with the heating of oxygen sensor 1 in bank 1.

Damage to your car’s wiring between the ECM or fuse can arise from physical damage such as wear and tear from heat and friction. Also, a rodent infestation or a water leak can damage the wiring.

Incorrect/Aftermarket Replacement Sensor Can Trigger P0135

If you recently replaced your car’s oxygen sensor with an aftermarket or incorrect replacement sensor, this could be the reason behind the error code. The reason is sensors are not created equal. For instance, they have varying resistances, voltage ranges, calibration curves, and response times.

Therefore, if you install an oxygen sensor that does not meet the specifications of your car, it may interfere with how the vehicle operates. As a result, the discrepancies may result in the ECM triggering the P0135 error code.

Weak Battery Can Cause Your Oxygen Sensor to Malfunction

A weak battery can also trigger this error because it interferes with the supply of power to the heater element in the oxygen sensor. When your car’s charge is low, the voltage will not be enough to heat the sensor quickly or properly.

This will result in weak or erratic signals from the sensor that do not indicate the correct level of oxygen in exhaust gases.

Once the ECM detects this issue, it will trigger this error code to indicate a problem with the heater element of the oxygen sensor. There are various factors that result in a weak car battery. These include using an old battery, a faulty alternator, a parasitic drain, or a corroded battery terminal.

What Is the Best Solution for the Honda P0135 Code?

The best solution for the Honda P0135 code is to replace a faulty heated oxygen sensor. Replacing it with the recommended sensor restores the proper function as intended and sends reliable signals to the ECM. This optimizes engine performance and clears the error.

The new sensor provides accurate and timely measurements of oxygen in exhaust gases. This happens because the heating elements in the new sensor function properly making the sensor reach optimal temperature fast.

Best Solution for the Honda P0135 Code ~ Ran When Parked

As a result, it decreases the delay before providing feedback especially when starting, which eliminates the error code in question.

As well, with the new sensor, the ECM detects improvements that not only turn off the error code but also the check engine light. When you clear the fault code and does reappear or trigger the engine light, you will have solved the problem.

Replace Blown or Missing Fuse for the Sensor Heating Element

You can also get rid of the P0135 error code by replacing the blown or missing fuse for the heating element. When you use a new fuse that meets your Honda car’s specifications, you ensure the heating elements of the oxygen sensor receive electrical power.

If you are wondering – how do I fix code p0135? Replacing a blown fuse is one way of doing it. Doing this will restore the sensor’s ability to reach its optimal operating temperatures.

As well, with the heating element working as it should, the oxygen sensor will provide accurate and timely feedback to the ECM. Replacing the fuse resolves the underlying issue that triggered the P0135 error code. As a result, the ECM will recognize the improvement triggering the removal of the P0135 error code.

Repair/Replace Faulty Wiring Between the Sensor and ECM/Fuse

Another way you can solve the p0135 error is by repairing or replacing faulty wiring between the sensor and the ECM or fuse. This will restore the connection to the heater element allowing it to warm the sensor. When replacing faulty connectors or wiring, make sure the replacement parts match the original ones.

Once you repair or replace faulty wiring or connectors, you ensure interference-free transfer of signals between the sensor and the ECM. Fixing the faulty wiring ensures electrical current can flow freely between the sensor and the fuse or ECM.

As a result, the sensor reestablishes the ability to receive power as well as its heater elements. Repairing or replacing faulty wiring eliminates the underlying issue triggering the P0135 error code.

Replace Incorrect Replacement Sensor With Genuine/OEM One

Replacing an incorrect or aftermarket replacement sensor with a genuine or OEM one can get rid of this error. The replacement helps solve compatibility issues when using an incorrect or aftermarket sensor. With a genuine or OEM sensor, you get accurate readings.

As well, a genuine sensor communicates effectively with your car’s ECM. What’s more, OEM sensors have the right heating calibrations. This way, the sensor is able to reach its operating temperature with ease. As a result, the sensor can deliver accurate and timely feedback to the ECM. This will ultimately solve the error code in question.

Charging or Replacing a Dead Battery With a New One

Another solution to this error code in your Honda involves charging or replacing a low or dead battery with a new one. With a fully charged or new battery, your car can supply stable voltage to electrical systems including sensors and the ECM.

Also, adequate battery power supports the oxygen sensor heating elements allowing the sensor to warm up fast. In addition, stable voltage allows the ECM to receive reliable sensor data. As such, addressing the issue of low battery voltage can help solve the P0135 error code.

Hire a Professional To Address the Cause of This Fault

Letting a professional mechanic diagnose and resolve the error is an excellent way of dealing with this error code. First, a professional mechanic has the experience and the tools to accurately identify the cause of the issue. This way, you will not need to replace unnecessary parts.

Hire a Professional To Address the Cause of This Fault ~ Ran When Parked

Besides, a professional will ensure the replacement parts are of quality and meet your car’s specifications. What’s more, a mechanic is more efficient and will save you time and frustration of dealing with the check engine issue. That is why involving a professional is one of the best ways of restoring the sensor heater circuit.

Honda P0135 Error Code Meaning Conclusion ~ Ran When Parked

Conclusion

In this post, you have learned the various triggers and solutions to the P0135 error code in your Honda.

Here is a quick recap of the post:

  • The main cause of this error code is a failing heated oxygen sensor.
  • Other causes are a faulty wiring harness, a blown or missing fuse, a weak battery, or the use of an incorrect sensor.
  • To solve this error, replace a failing heated oxygen sensor.
  • Other solutions include replacing a blown or missing fuse, repairing faulty wiring, replacing an incorrect oxygen sensor, or charging/replacing a dead battery.
  • Also, you can hire a professional.

With this understanding, as a Honda owner, you can pinpoint the trigger of this engine code and apply the correct solution.

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