How to Bypass Oxygen/O2 Sensor, A Step by Step Guide

How To Bypass Oxygen Sensors

A lot goes into making your dream car shine through its performance. One of the intricate parts includes knowing how to bypass oxygen / O2 sensor. Do you know how to do it?

No, you don't need to splurge on the mechanics for this. We have done enough research for you just to pull through these steps and forget about it later. Keep reading to learn more.

A reason to opt for bypassing your oxygen sensor is for efficient tuning of the engine. If you’re into off-road racings or have mediocre knowledge on how to tune the engine, then bypass may be your most effective option. Furthermore, it revokes the engine for casual system errors, which is an added bonus.

Other reasons you need an oxygen sensor bypass are if you don't own a catalytic converter and keep in check if the engine light isn't always switched. Thus, you must know how to bypass the O2 sensor on the catalytic converter and bypass O2 sensor check engine light.


How To Bypass Oxygen / O2 Sensor

  • Step 1
    Before you begin, you must let your car cool down completely. You will be working with the engine, and on the exhaust systems, so it's wise to wait for a couple of hours before you start.
  • Step 2
    Once you’re satisfied with its temperature, you will need to disable the cable that runs the negative battery terminal. Loosen the nut that’s situated on the cable clamp and gradually slide it off.
  • Step 3
    Raise your car using jack stands. You will need to raise the front part; hence, place the jack at the front jack point. The best way to do it is by placing it at the rear of the radiator. ( Read more: clogged radiator symptoms )
  • Step 4
    You will need to locate the front pinch welds and situate the jack under each of them. Gradually lower your car so that it stands upon the jack stands.
  • Step 5
    Look for the oxygen/O2 sensors now. These usually look like plugs that protrude out of the engine's exhaust system. Each of these is typically found at the rear and the front of the catalytic converter. 
  • Step 6
    Carefully, unhinge the electrical wire that’s embedded within the sensor. Squeeze to release and pull it out gently from the oxygen/O2 sensor’s housing.
  • Step 7
    You will now need to remove the sensor. In order to do so, rotate the oxygen sensor counterclockwise. Utilize a removal tool at this point.
  • Step 8
    Plug in the dummy oxygen/O2 sensor by rotating it clockwise. Insert it into the exhaust system and connect it to the electrical wiring.
  • Step 9
    You can now lower the car onto the ground, but wait, we’re not done yet!
  • Step 10
    Once your vehicle is safely lowered to the ground, you will need to start the engine.
  • Step 11
    Note, if the check engine lights come on and how long they stay on. Now, this is the tricky part as it works in cycles. So, if the check engine light remains on, keep driving casually until they go off. Once the cycle is complete, your car's computer will operate, thinking that the oxygen/O2 sensor is still there and is tuned up legitimately. Once this cycle is complete, you're done!

Frequently Asked Questions (FAQs)

1). What is an oxygen/O2 sensor?

The oxygen/O2 sensors are responsible for measuring the oxygen proportion in the engine of a vehicle. It is an essential part of the emission system. To burn gasoline and to keep the internal combustion cycle intact, a specific ratio of oxygen is needed. Oxygen/o2 sensors indicate and help in maintaining these balances in check.

2). Why are oxygen/O2 sensors necessary?

The sensors are connected to the exhaust pipe in the engine, and when the oxygen/O2 sensors fail, the fuel efficiency can drop drastically. This happens due to gas loss. This will further cause the vehicle to have too much air and run 'lean.' This doesn't only hamper the vehicle's health but also creates a staggering amount of unwanted pollution.

3). Can oxygen sensor be bypassed?

It is usually done utilizing a dummy oxygen sensor, and as O2 sensors are part of the car’s emission control system, it can also be replaced using a dummy O2 sensor bypass.

4). Can we disconnect the O2 sensor?

Never unplug the O2 sensor bypass. They are in charge of the mixture of air-fuel. It will not only give you a tough time, but it will also evoke a substantial crisis in the engine.

5). Can you delete O2 sensor?

Removing the oxygen sensor using a wrench is viable. However, there needs to be a plug connecting into the oxygen/O2 sensor. This will ensure that the exhaust systems work adequately, and the gasses escape through the pipes.

6). Causes of O2 sensor to fail.

The more experience you have with driving, the more you will be used to the gunk and contaminants accumulating in the exhaust system. These eventually lead to further leaks and excess oil coagulants, which inevitably fail the system.

7). Signs of a faulty oxygen/O2 sensor?

  • Failure in the emissions test.
  • Deduction in fuel mileage.
  • Check engine light constantly on.
  • Stalling, degrading performance, and rough idling.
  • O2 sensor failure indicated by the code checker.

8). How much does it cost to repair an oxygen/O2 sensor?

Fixing an O2 sensor could cost somewhere around $100-$200. Also, there will be another added charge of the professional mechanic, which would be around $100. Overall, you will have to spend about $300, whereas the expenditure goes down when you fix it yourself.

Last Words:

Utilizing a dummy O2 sensor is basically another form of trick O2 sensors. It enables your vehicle to think that the catalytic converter is present, whereas, in reality, it isn't.

A cool method, isn't it? As easy as fooling your car is, it's much harder to keep everything in check. There are plenty of ways you could abide by while evaluating how to bypass oxygen sensor, but this has to be the easiest one yet. Give it a try and watch out for those check engine lights!


About the Author JamesL Davis

James is a certified auto technician specializing in commercial vehicles. With 30 years of experience under his belt, James has encountered almost every type of automotive issue there is! Besides his day job at the repair shop, he is also an amateur race car driver.

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