P0135 OBD2 Code: Causes, Symptoms, Diagonose & Fixes

If you want to know how to fix the P0135 OBD2 code, then you are in the right place. We are going to look at what the error code means and how to fix it. We want you to have confidence when you are dealing with error codes on your vehicles.
Definition of Code P0135: (Bank 1, Sensor 1) Heater Circuit Malfunction in Oxygen Sensor

Meaning of Error Code P0135 

The error code will appear when the control module tests the heated oxygen in the heating circuit on bank one. It is here that the error will be detected. It is going to detect a short in the circuit. It could be a short or resistance in the circuit. 

What to Expect with Error Code P0135

This is a code that is not too worrisome. You do not have to get to it now, but it should be taken care of as soon as you can. If you do not take care of it, you can pay more for repairs in the future. Take the time to fix the problem now, do not wait until there are further problems to fix it. 

Symptoms and Causes of Error Code P0135 

A check engine light will appear on your dash. You will find that the vehicle does not get as good of gas mileage as it may have once gotten. You may also notice that the engine will run rough. It will not be the smoothest ride, and you will spend more money on gas if this error is on your vehicle. 

There are several things that can factor into this error code appearing on your vehicle. This could be as simple as a faulty sensor or as complicated as the control module not working properly. Here is a list of potential factors that could cause this error to appear. 

• Sensor is Faulty 
• Bad Wires/Connections 
• Short/Open Wires in the Ground 
• Fuse is Blown 
• Coolant Sensor Working Improperly 
• Power Control Module is Faulty 

Diagnosing and Repairing Error Code p0135 

You will find that this is not something that is hard to diagnose or repair. On a scale of five, this is ranked a two. Remember that all vehicles are slightly different. This may not work on your vehicle. However, here is the diagnosing and repairing process. 

1. The first thing you will do is a road test. You want to make sure all codes are cleared. You will need a scanner to do this. You will want to ensure that you have the proper code. If the check engine light appears and you receive the error code P0135, continue to the next step. 
2. Make sure that your oxygen sensors are getting power. They need voltage to work. You can use the manual found in your vehicle to help you find the harness connector. The connector will hold the oxygen sensor for bank one sensor. At this point, make sure that the harness is disconnected. You will want to utilize the manual for your vehicle to test for power in your O2 sensors. 
3. Ensure that you are looking at all the wires and connections. You should always check these items for damages. You want to make sure that your sensor is clean as well. Make sure that you are fixing any wiring damage as you find it. Always fix connections as well. 
4. Ensure that there is ground. Make sure to look at the vehicle’s manual to locate this item. If you find corrosion or the connection is loose, fix it. Make sure that all corrosion is removed and tighten the wires. 
5. If you have done everything stated and the check engine light still is one reading error code P0135, change the sensor located in bank one. It is sensor one. This O2 sensor is the final problem. 

If you find that you still cannot fix the problem, your local mechanic can help you. They will look at the power control module and engine control module. The mechanics will determine if it is a more serious issue or not. 

Avoiding Common Mistakes When Diagnosing P0135 OBD2 Code

You will find that most people do not take the time to look at everything. They do not follow the steps listed above. This means that most people will go out and purchase the O2 sensor and replace it. They will not find the problem if they replace the sensor. Always follow the procedures outlined above. 

Fixing Error Code P0135

This error code is not the hardest to fix. It is also something that can be relatively cheap if you know how to do it. The parts are going to cost anywhere from one hundred dollars to much more. It will all depend on what is causing the problem. Remember, each case is different. 

Have Issues with Error Code P0135?

If you are having issues with this error code, it may be time to take it in. If you have done everything on the list above with no budge, take it in. You may not be looking at the right item, or it may not be simple to fix on your own. 

Taking your vehicle in will be more expensive; however, it will be worth it. You will know what is wrong with your vehicle. You may also have an auto-body shop diagnose the problem with your vehicle if you can fix it at home. This might help you save money. 

Wrapping Up

Taking the time to educate yourself with error codes is important. It would be best if you were educated so that you know how to fix common problems. These error codes will occur quite often. Knowing how to deal with them is the hard part. Taking the time to educate and read this article will help you know how to fix the problem yourself. Plus, who doesn’t like saving money? Saving money by working on your own vehicle will be something you should always consider.

Related codes:

• P0422
• P0421
• P0420
• P0414