Does your vehicle sound rough, and the check engine light (P0134) is on? Learn how to fix it by replacing the Oxygen Sensor of your Acura vehicle.
Acuras equipped with a four-cylinder engine have two oxygen sensors, an upstream and a downstream sensor. The upstream sensor is before the catalytic converter (Bank 1 Sensor 1), and the downstream is after the catalytic converter (Bank 1 Sensor 2). Acuras equipped with the 3.5L engine have two catalytic converters and four O2 sensors. In the following guide, you will find instructions on changing the upstream oxygen sensor on Acura vehicles.
What you will need
- ACURA Oxygen Sensor,
- Oxygen Sensor Tool
- Mechanic Metric Toolset
Procedure
Park the ACURA and open the hood. The following video shows you how to open the hood on your Acura.
Disconnect Negative Terminal. Locate the battery on the driver’s side of the engine bay and disconnect the negative battery terminal. Use a 10mm socket to loosen the nut on the black negative (-) cable and pull the cable away from the battery post.
Locate the O2 Sensor on the exhaust manifold.
Disconnect Sensor. Press the connector and pull it away to unplug the oxygen sensor. 
Place the oxygen sensor socket on the sensor and break it loose. Removing the oxygen sensor on an old ACURA may be difficult at first due to rust. If the sensor doesn’t come off, spray penetrating oil near the threads and wait at least 15 minutes. 
Install the new oxygen sensor. Tighten the new ACURA oxygen sensor to the recommended torque using a torque wrench. Typical torque settings are provided below.
Connect the oxygen sensor wire harness by plugging it in until you hear it click. If you use a universal oxygen sensor, you will need to use the diagram with the sensor to find out which wires to splice. 
Torque Specifications
Torque Acura oxygen O2 sensor to 44nm/33 lb-ft.
Applications
This general guide applies to Acura models such as
- CDX
- CL
- VSX
- EL
- ILX
- Integra
- Legend,
- MDX
- NSX
- RDX
- RL RLX
- RSX
- SLX
- TL TLX
- TSX
- Vigor, ZDX
Note that Acura vehicles can have up to four oxygen sensors.
Symptoms
The most common symptoms that you have a bad oxygen sensor are:
- Check Engine Light is ON
- A decrease in fuel economy
- Engine Hesitation or misfire
- Rough Idling
Oxygen Sensor Replacement Cost
The cost to replace the Acura oxygen sensor is $30-$120. Changing the oxygen sensor at the dealer can cost between $350 and $600. Changing an Acura oxygen sensor at auto repair shops ranges from $250 to $450.
Check Engine Light Still On
If the check engine light is still on after you replace the O2 sensor, you can use the YOUCANIC Full System Scanner to clear the stored codes. This scanner can also read and clear fault codes on every control module of your Acura vehicle.
We hope you find the Replace Acura Oxygen Sensor O2 Sensor guide helpful. Looking to save money by replacing an Acura O2 sensor yourself? Check out these Acura maintenance and troubleshooting guides for more help.