Which 02 sensor to replace

This, on top of his great skills and know-how of working with an automobile and a very friendly, likeable personality. Unfortunately, it took multiple attempts to fix the Check Engine light on my vehicle. The car needed O2 sensor replacement but due to a couple of reasons the problem was not getting fixed. So Joel would come, run the tests, fix the problem, do the test drive, and leave thinking the problem has been resolved only to find out from me later that the Check Engine light is back on.

However, Joel followed up patiently with me over the course of couple of months to ensure that the problem was fully resolved, even if it took him a couple of visits. Well, he has my business from now on and full trust for my cars! Thank you, Joel! Joel showed up right on time. Replaced O2 sensors on my Ford Expedition. Was in and out within an hour. Ensured my driveway was clean when he left and did not leave any mess.

I was very pleased with his professionalism. Definitely recommend Joel for auto repair. James 30 years of experience. Request James. Toyota Camry V James dis an awesome job on my toyota camry. He was punctual and professional. He fixed the problem very quick. Shane 17 years of experience. Request Shane.

Ford F V Shane is great. I will be calling on him soon on other vehicles I own. Thank you Shane for a great job. Need Help With Your Car? Related articles. Read more. Related questions Bad crank sensor Hello. Just about anything is possible but it is unlikely.

It indicates that the Catalytic Converter is not functioning efficiently, so the vehicle is increasing the output of harmful pollutants. For an idea of how to troubleshoot P, check out the video below:. P - System Too Lean Bank 1. Replacing the O2 sensor is not as complex as you think, but monitoring the vehicle and know when to do it is not as simple.

I hope the article above provides you with basic information about the O2 Sensors. Have you changed an O2 sensor? What did you do about it? What do you think is the most important part of the process? Please feel free to comment below and join the conversation! Auto Saving Center. Mileage Log Subscription. Total Saving. Shipping Calculated at next step. How many O2 sensors does my vehicle have? Bad Gas Mileage Are you filling up your gasoline tank more often than usual?

Previous Next. Soak the sensor thread area with a powerful penetrating lubricant. Starting and revving the engine should further aid in loosening the sensor by heating up the bung. If you are using an open end wrench, try an O2 socket. If this fails, try a long ratchet or breaker bar in conjunction with your socket to generate more torque.

If you are still unsuccessful, heat the bung with a torch until cherry red and remove the sensor. After the sensor is removed, be sure to use a thread cleaner to clean up the bung threads. In some cases the threads will need to be repaired. This can be done with a thread repair kit Walker Part Do not use an impact wrench to remove an O2 sensor, as you will most likely strip the threads in the bung.

For any issues requiring the replacement or addition of a bung, Walker carries a full line of oxygen sensor bungs and plugs. Our Find Your Part lookup at www. Modern cars can have up to 6 or more O2 sensors.

The role of the downstream sensors is to monitor the output and health of the catalytic converter. Removing them will take away this function, and produce a CEL check engine light or MIL malfunction indicator light on the vehicle.

Not necessarily. The oxygen sensor simply reports the data that it gathers. For example, if you are getting a lean mixture code, you may have a vacuum leak or a faulty fuel injector. Replacing the oxygen sensor will not fix this problem. You will just get the same code again. It is best to replace O2 sensors in pairs.

For example, if you replace the downstream left sensor, you should also replace the downstream right. However, on most vehicles produced since , replacing one sensor especially the front engine monitoring sensor will cause the ECU to set a code for the other sensors. This is because the new sensor switching activity is much faster than that of the older aged sensors. It is probable that on most vehicles, the code will be set within days AFTER the first sensor replacement.

Heated oxygen sensors should be checked or replaced every 60, miles, while unheated oxygen sensors should be checked or replaced every 30, miles. You can test the O2 sensor on a vehicle by first identifying the signal wire on the sensor.

Secondly, by using a voltmeter with the scale set to 1 volt, the voltage will fluctuate between and millivolts or. A second method is to connect some of the various testers available on the market directly to the oxygen sensor.

This method is not as accurate, but can detect some of the sensor failures. A California emissions O2 sensor is meant for vehicles that are designed to meet California emission regulations. However, the oxygen sensor is not the only cause of these symptoms.