While not a funny job, replacing the O2 sensors on her TL will offer your ride better mileage and manners. Instead of them when needed will conveniently save the driver sufficient in fuel to get rid of the replacement cost. Read on to get the low down on replacement.

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This article applies to the Acura TL (2004-2008).

The O2 sensors offer the computer indication of just how much oxygen is in the exhaust stream, and also therefore allow it to do decisions on just how much fuel come put into the system to get the air/fuel mixture together close come stock as possible. While the O2 sensors don"t must be changed very often, generally every 100k miles, they do thrive lazy over time. As soon as this happens, fuel usage suffers. Usually the fuel mileage goes under over an extended duration of time, so gradually that most auto owners don"t realize it has happened. When replaced and the computer is reset, fuel mileage will go up, periodically dramatically. This project is generally a tiny harder than most for one reason: after 100,000 miles in the very hot exhaust system, the O2"s will certainly be nearly welded into place.


Materials NeededRatchet and/or breaker barO2 sensor socketExtensions as neededAnti-seize compound

Selecting the appropriate O2 sensor to replace have the right to be daunting to figure out for the uninitiated. Because that the TL, there space four different O2 sensors: two located prior to the cat (upstream) and two ~ (downstream). Special, the one to the rear of the engine and also before the cat is considered financial institution 1, sensor 1 or B1S1. The sensor after ~ the cat on the same side is considered financial institution 1, sensor 2, or B1S2. The sensors at the former of the engine are thought about B2S1 and B2S2, respectively.

It is proclaimed on the forums to continue to be away indigenous the Bosch share sensors, together these don"t job-related well through the engine administration on the TL. There are several brands which have the right to be chosen, yet Honda/Acura OEM sensors room preferred. You can never walk wrong with OEM anything. It is also highly encourage to readjust out the O2 sensors in pairs. If you have a password for one sensor being negative (upstream), change both. The downstream sensors space not nearly as vital to replace in pairs as their only job is come ensure the proper function of the cat and do not impact how the engine chin runs.

Step 1 – remove engine covers and retrieve radio code

Raise the hood. If present, remove every one of the engine covers, because they will certainly be in the way.

If you don"t already have them, retrieve the five digit radio code. There space three basic places where the code might be. First, look in the owner"s manual. Initially there to be a map which came from the factory with the code on it along with the serial number. Second, that may have actually been written in the maintenance hands-on by the technician who first worked on the car when the was got by the dealership. Third, the code might be on a nondescript white sticker, which would have been put either in the glove box or in the trunk, again, through the very first technician.

If the password cannot be discovered in any kind of of these places, all is not lost. Retrieve the serial number of the radio native the radio chin by pressing the 1 and 6 buttons at the exact same time, then pushing the top top button. The eight number number will show up in the display in two segments. Call Acura customer Services in ~ 1-800-382-2238 with your VIN and also the serial number and also they can give you the code. After you are sure you have the radio code, disconnect the battery so the computer will reset fuel tables earlier to factory.

Figure 1. Radio code tag.

Step 2 – remove strut tower brace

Remove the strut tower brace by removed the three 12mm nuts and solitary 10mm bolt native the passenger next (left side figure 2), then remove the three 12mm nuts and also two 10mm bolts indigenous the driver next (right side figure 2). To make removal the the bolt ~ above the passenger side easier, disconnect the attached part of the wiring exploit (red arrow, left side figure 2).

Figure 2. Strut tower brace removal.

Step 3 – eliminate O2 sensor

Locate i m sorry O2 sensor from number 3 will be removed first. In the image, the sensors room numbered 9, 10, 11, and also 12. Usage the O2 sensor socket to break the sensor free. Disconnect O2 connector native wiring harness. Usage the socket, if necessary, to complete unscrewing the sensor and remove from vehicle. A 7/8" combination wrench can sometimes be of use right here to aid removal. Inspect the old sensor versus the new sensor come ensure the wiring plugs room the very same configuration prior to proceeding. Depending on which brand is purchased, the sensor finish may it is in different.

Figure 3. O2 sensor diagram.
Pro Tip

During removal, if you inspect the pigtail that the old sensor against the brand-new sensor and ensure you have actually the correct sensor, reduced off the pigtail the the old sensor. This makes it much simpler to traction the O2 sensor fairly than fumbling v it as the sensor turns around and around.


Don"t touch the company end that the O2 sensor, together this can damages or destroy it prior to it"s ever before installed.

Place a little amount the anti-seize compound on the object of the sensor. Screw the sensor right into the sensor bung and also hand-tighten. Complete tightening by making use of the socket. For sure the crush washer is in full call with the bung to avoid leaks right into the exhaust system, which can interfere with proper O2 function.

Figure 4. Brand-new and old O2 sensors.

Step 5 – Re-code the radio

After replacing impacted sensors, change the strut tower brace. If the procedure has actually taken much more than 30 minutes, affix the battery. Making use of the code acquired in action 1, revolve on the car to check out "code" in the display. Entry the five digit code and the radio should come to be live again.

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If navigation is set up in her TL, it will call for a 4 digit code. If the sticker for the radio was placed, the Navi code should be close by.