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Acura RL Oxygen Sensor Guide for 2005-2012 Models

Understand your RL's oxygen sensors to fix check engine lights and restore performance.

4 minutes to read 2005-2012 Acura RL
Difficulty
2/5
Est. Time
0.75 hrs
DIY Doable?
✅ Yes
Shop Labor
$100-$250
⚠️ Drivable, but... — Yes, but you should get it fixed soon to avoid poor fuel economy and potential damage to your catalytic converter.
Key Takeaways
  • Your 2005-2012 Acura RL has four oxygen sensors; identify the correct one before buying.
  • For best results, especially for upstream sensors (Sensor 1), use OEM-equivalent brands like Denso or NGK/NTK.
  • A bad oxygen sensor can decrease fuel economy and damage your expensive catalytic converters over time.
  • Replacing an O2 sensor is a manageable DIY job with a special O2 sensor socket.
Your 2005-2012 Acura RL has four oxygen sensors that are critical to its engine performance and emissions. These sensors measure the amount of unburned oxygen in the exhaust. There are two upstream sensors (also called air-fuel ratio sensors) that help the engine's computer fine-tune the air-to-fuel mixture for optimal power and efficiency. The two downstream sensors are located after the catalytic converters and monitor their performance to make sure your car is not polluting. When these sensors work correctly, your RL's V6 engine runs smoothly and efficiently.

Is a Bad Oxygen Sensor a Big Deal?

Side-by-side comparison of a clean, new oxygen sensor versus a failed sensor covered in heavy carbon soot and oil deposits.
A healthy oxygen sensor (left) has a clean probe to accurately measure exhaust gases, while a fouled sensor (right) will provide sluggish or incorrect readings to the ECU.

A failing oxygen (O2) sensor can cause more than just an annoying check engine light. It can lead to real performance problems and even damage other expensive parts. When a sensor provides bad information to your car's computer, it can result in poor fuel economy, a rough idle, hesitation when you accelerate, and a failed emissions test. 🎬 Watch this guide on common bad oxygen sensor symptoms. If you ignore a bad upstream sensor for too long, the incorrect air-fuel mixture can eventually damage your catalytic converters—a very expensive repair compared to replacing a sensor.

Sensor Locations Explained

Your Acura RL has a V6 engine, which means it has two "banks." Bank 1 is the cylinder head closer to the firewall (the back of the engine bay), and Bank 2 is closer to the radiator (the front). Each bank has two sensors:

  • Sensor 1 (Upstream): Measures the air-fuel ratio coming out of the engine. This is the most critical sensor for performance.
  • Sensor 2 (Downstream): Measures the efficiency of the catalytic converter.

So, a code for "Bank 1, Sensor 2" refers to the downstream sensor on the firewall side of the engine. A code for "Bank 2, Sensor 1" is the upstream sensor on the radiator side.

🎬 See a visual guide for all Acura RL sensor locations.

Choosing the Right Aftermarket Oxygen Sensor

A new Denso or NTK brand oxygen sensor in its retail packaging, showing the direct-fit connector.
For Acura RL models, choosing OEM-equivalent brands like Denso or NTK (NGK) ensures the heater circuit and connector match factory specifications.

When replacing an oxygen sensor on your Acura, the brand you choose matters. For Honda and Acura vehicles, using an original equipment manufacturer (OEM) equivalent is highly recommended for the best performance and to avoid compatibility issues.

Tier 1: OEM-Equivalent Brands

Denso & NGK (NTK): Denso and NGK (under their NTK brand) are the original equipment suppliers for most Honda/Acura vehicles. Choosing a Denso or NTK sensor is the closest you can get to buying the part from an Acura dealer, but at a lower price. These sensors are designed to match the exact specifications of your RL, ensuring they work correctly without causing new problems. For upstream (air-fuel ratio) sensors, it is strongly advised to stick with one of these brands.

Tier 2: Quality Aftermarket Brands

Bosch & Delphi: Bosch is a massive OEM supplier for many European cars and a reputable name in aftermarket parts. While their sensors are generally high quality, some forum users prefer to stick with Denso or NGK for Japanese vehicles to guarantee perfect compatibility. Delphi is another trusted OEM supplier with a solid reputation. These brands are a good choice, especially for the less-critical downstream sensors.

Tier 3: Budget-Friendly Options

Walker Products, Spectra, DriveWire: These brands offer a more affordable alternative. They can be a good option if you are on a tight budget, particularly for a downstream (Sensor 2) replacement, which primarily monitors the catalytic converter and has less impact on engine performance. However, for the critical upstream (Sensor 1) positions, spending more for a Denso or NGK sensor is a wise investment to prevent potential performance issues.

Oxygen Sensor Cost for 2005-2012 Acura RL

Part Type Estimated Cost
New OEM (from dealer) $200 - $400+ per sensor
New Aftermarket (OEM-Equivalent: Denso, NGK) $80 - $200 per sensor
New Aftermarket (Quality/Budget) $25 - $100 per sensor
Shop Labor $100 - $250 per sensor

Pro Tip: Direct-Fit vs. Universal Sensors

You will see "direct-fit" and "universal" sensors for sale. A direct-fit sensor comes with the correct plug for your RL and is ready to install. A universal sensor is cheaper but requires you to cut the old plug off and splice it onto the new sensor's wires. While this saves money, an improper connection can cause the new sensor to fail. For a hassle-free repair, always choose a direct-fit sensor.

Frequently Asked Questions

The engine bay of an Acura RL showing the locations of the Bank 1 and Bank 2 oxygen sensors.
The Acura RL's V6 engine features four sensors: two upstream (Sensor 1) on the manifolds and two downstream (Sensor 2) after the catalytic converters.
How many oxygen sensors does my 2005-2012 Acura RL have?

Your Acura RL has four oxygen sensors: two upstream (Bank 1 Sensor 1 and Bank 2 Sensor 1) and two downstream (Bank 1 Sensor 2 and Bank 2 Sensor 2).

What tools do I need to replace an oxygen sensor?

You will need a special tool called an oxygen sensor socket, which has a slot for the wire to pass through. You'll also need a ratchet and potentially some penetrating oil like WD-40 to loosen the old sensor, as they can be very tight from heat and rust.

🎬 Follow this step-by-step Bank 2 Sensor 1 replacement video.
Can I replace just one sensor?

Yes. You only need to replace the specific sensor that has failed and triggered the diagnostic trouble code. The sensors do not need to be replaced in pairs.

Is there a recall or TSB for the oxygen sensors on my RL?

As of late 2023, there are no specific recalls or widespread Technical Service Bulletins (TSBs) from Acura for oxygen sensor failure on the 2005-2012 RL. Failures are typically due to age and normal wear.

Bad Oxygen Sensor Symptoms – How to Tell If Your O2 Sensor Is Failing? Full Guide!
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Bad Oxygen Sensor Symptoms – How to Tell If Your O2 Sensor Is Failing? Full Guide!
2005 Acura RL oxygen sensor replacement bank 2 sensor 1 P0154 P2254
▶
2005 Acura RL oxygen sensor replacement bank 2 sensor 1 P0154 P2254
2005 -2006 Acura RL Oxygen sensors locations BANK 1 sensor 1 and so on.
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2005 -2006 Acura RL Oxygen sensors locations BANK 1 sensor 1 and so on.

Technical Specifications

OEM Part Numbers: 36531-RCA-A02 36531-RDM-A01 36532-RJA-A01 36542-RJA-A01

The 2005-2012 Acura RL uses four heated, 5-wire wideband oxygen sensors, also known as air-fuel ratio (LAF) sensors for the upstream positions.

Wrenchy
Article researched & written by
Wrenchy
Go-Parts' AI research assistant. Every article is backed by live web research, verified OEM data, and real technician knowledge — so you get accurate, up-to-date information you can trust.
Meet Wrenchy → Updated Jun 1, 2026

The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.

Year Coverage
This article covers the Oxygen Sensor for:
  • Acura RL: 20052006200720082009201020112012
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