NGK NTK 24061 OE Type Direct Fit Downstream Oxygen Sensor Honda Odyssey Acura NSX Isuzu Oasis

The 24061 is a direct-fit, OE-type narrowband downstream oxygen sensor built specifically for the 1995-1999 Acura NSX V6, 1996-1998 Honda Odyssey L4, and 1996-1999 Isuzu Oasis L4. Made in Japan by NTK, the sensor division of NGK, the 24061 replaces the post-catalytic converter switching sensor at the Bank 2 Sensor 2 position on the NSX and the downstream Bank 1 Sensor 2 position on the Odyssey and Oasis. This is a heated, 4-wire, direct-fit unit with an M18 x 1.5 thread and a rectangular 4-pin female blade connector that mates directly to the factory harness with no splicing required.

NTK OE-Grade Technology Inside the 24061

NTK is not just an aftermarket brand. NTK sensors are manufactured in the same Japanese facilities that supply oxygen sensors to Honda and Acura on the original assembly line. The 24061 is built to the same tolerances as the sensor your vehicle left the factory with. Key engineering features include:

• Dual-coated platinum sensing element for extended service life and accurate air-fuel ratio signal switching in the post-cat environment.
• 3-stage plasma jet overcoat with a contaminant-resistant deposit trap barrier that shields the zirconia element from exhaust carbon, silicone, and lead poisoning.
• Pure alumina ceramic filter that conditions exhaust gas before it reaches the sensing element, reducing signal noise and improving switching accuracy.
• PTFE-coated wiring harness for heat resistance and long-term connector integrity in the underbody thermal environment.
• OE-matched rectangular 4-pin female blade connector that plugs directly into the factory harness on all covered Honda, Acura, and Isuzu applications.
• Pre-applied or enclosed anti-seize compound on the M18 x 1.5 threads, protecting the sensor bung and simplifying future sensor removal.
• Heated element design reaches operating temperature within seconds of a cold start, giving the ECU a valid downstream signal faster than an unheated sensor could.
• Made in Japan by the same manufacturer that built the OEM sensors for these Honda, Acura, and Isuzu platforms.

Downstream vs. Upstream Sensors, and Narrowband vs. Wideband: What the 24061 Is and Is Not

Oxygen sensors are not interchangeable. Your vehicle uses at least two sensors per bank: one upstream (before the catalytic converter) and one downstream (after the catalytic converter). The 24061 is strictly a downstream, post-catalyst sensor. It does not replace the upstream air-fuel ratio or pre-cat oxygen sensor on any of the covered vehicles.

The upstream sensor on the Acura NSX (positions Bank 1 Sensor 1 and Bank 2 Sensor 1) uses different NTK part numbers. The same applies to the upstream position on the Honda Odyssey and Isuzu Oasis. Ordering the wrong position sensor is the most common O2 sensor installation mistake. Confirm your position before ordering.

There are two fundamental sensor technologies. Narrowband (switching or zirconia) sensors output a voltage that swings between roughly 0.1V and 0.9V to tell the ECU whether the exhaust is rich or lean. They are used in downstream, post-cat monitor positions on nearly every naturally-aspirated engine from the 1990s and 2000s. Wideband (or air-fuel ratio) sensors output a continuous linear current signal across a wide lambda range and are used upstream on newer engines for precise fueling control. The NGK24061 is a narrowband switching sensor. It is correct for the downstream post-cat position on all covered applications. Do not install a wideband AFR sensor in this location.

What's Included with the 24061

• 1x NTK 24061 downstream oxygen sensor with pre-attached wiring harness and OE-matched connector
• Anti-seize compound (pre-applied to threads or enclosed separately per NGK installation instructions)

The NGK24061 is sold individually, as a pack of one. No additional connector pigtails, sockets, or thread chasers are included. The sensor is a direct plug-in fit for all listed applications and requires no wiring modifications.

Vehicle Fitment for the 24061

The 24061 fits the downstream post-cat oxygen sensor position on the vehicles listed below. Every application year is listed as a separate row. The 1995 Honda Odyssey uses a different sensor and is not covered by this part. On the Acura NSX, this sensor fits the Bank 2 Sensor 2 (downstream rear) position only. Confirm your year, make, engine, and sensor position before ordering.

OEM and Aftermarket Cross-Reference for NGK24061

The 24061 is a direct replacement for the following OEM and aftermarket part numbers. Use this table to confirm your existing sensor number against the 24061 before purchasing.

Full Specifications

Warranty and Legal

The 24061 carries the standard NGK manufacturer warranty of 60 days from the date of delivery. This warranty covers defects in materials and workmanship under normal operating conditions. The warranty does not cover sensors that have been contaminated by engine coolant leaks, oil burning, silicone sealants used near the sensor bung, leaded fuel, or physical damage from improper installation.

Magnuson-Moss Warranty Act: Installing the 24061 in place of your OEM downstream oxygen sensor will not void your vehicle's factory powertrain warranty. Under the federal Magnuson-Moss Warranty Act, a manufacturer or dealer cannot void your powertrain warranty simply because you installed an aftermarket part. They must demonstrate that the aftermarket part directly caused the specific failure being claimed. NTK sensors are manufactured to OEM specifications by the same company that supplies original equipment sensors to Honda and Acura.

California Proposition 65 Warning: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and reproductive harm. For more information, visit www.p65warnings.ca.gov.

About NGK and NTK

NGK Spark Plugs Co., Ltd., now operating as Niterra Co., Ltd., is a Japanese manufacturer headquartered in Nagoya, Japan. Founded in 1936, NGK is the world's largest manufacturer of spark plugs and a leading producer of technical ceramics and sensor components. NTK is the sensor division of NGK, specializing in oxygen sensors, temperature sensors, and other engine management components.

NTK oxygen sensors are original equipment on Honda, Acura, Toyota, and numerous other OEM platforms. The same Japanese facilities that produce OEM sensors for factory assembly lines manufacture NTK aftermarket replacement sensors. This means the 24061 is not an approximation of the OEM Honda sensor: it is produced by the same manufacturer, to the same engineering specifications, as the sensor your vehicle was built with. For NSX owners, this is particularly significant, as NTK is the OEM supplier for the NSX's downstream oxygen sensors.

Frequently Asked Questions

What is the difference between a downstream and upstream oxygen sensor, and which one is the 24061?
The upstream sensor (Sensor 1 or pre-cat sensor) sits before the catalytic converter and sends a real-time exhaust mixture signal to the ECU for fuel trim correction. The downstream sensor (Sensor 2 or post-cat sensor) sits after the catalytic converter and monitors catalytic converter efficiency by comparing its signal pattern to the upstream sensor. The 24061 is the downstream, post-cat sensor. It is not the upstream air-fuel ratio or pre-cat sensor. On the Acura NSX it occupies the Bank 2 Sensor 2 position. On the Honda Odyssey and Isuzu Oasis it is the Bank 1 Sensor 2 position. Order the correct position for your application.

How often should I replace my downstream oxygen sensor?
Heated downstream oxygen sensors typically have a service life of 60,000 to 100,000 miles under normal conditions, but sensors on vehicles from the mid-1990s are now 25 to 30 years old and should be inspected or replaced proactively if a check engine light appears or if fuel economy has declined unexpectedly. A lazy or failed downstream sensor will trigger OBD-II fault codes and can cause the ECU to misread catalyst efficiency.

What fault codes will a bad downstream sensor trigger? Will it cause a check engine light?
Yes. A failed or degraded downstream oxygen sensor will trigger the check engine light (MIL). On OBD-II equipped vehicles, the most common codes associated with the downstream sensor position covered by the 24061 are P0136 (O2 Sensor Circuit Malfunction, Bank 1 Sensor 2), P0141 (O2 Sensor Heater Circuit Malfunction, Bank 1 Sensor 2), P0156 (O2 Sensor Circuit Malfunction, Bank 2 Sensor 2), and P0161 (O2 Sensor Heater Circuit Malfunction, Bank 2 Sensor 2). On the Acura NSX, Bank 2 Sensor 2 codes are the specific downstream rear codes. Clear the fault code after installation and confirm the light does not return.

Does installing the 24061 void my factory warranty?
No. Under the federal Magnuson-Moss Warranty Act, an automaker or dealer cannot void your factory warranty solely because you replaced an oxygen sensor with an aftermarket part. They must prove that the aftermarket sensor caused the specific failure being claimed. NTK sensors are manufactured to OEM specifications by the same Japanese facilities that supply Honda and Acura with original equipment sensors.

This product shows a California Proposition 65 warning. Is it safe to install?
Proposition 65 warnings are required on a broad range of automotive parts because they may contain trace amounts of regulated substances such as lead in solder or other materials. The warning does not mean the product is unusually dangerous to install or use in normal automotive service. Take standard precautions: wash your hands after handling, avoid prolonged skin contact, and dispose of the old sensor responsibly. For more information, visit www.p65warnings.ca.gov.

Does the 24061 fit the Acura NSX? Which sensor position on the NSX does it replace?
Yes. The 24061 fits all 1995-1999 Acura NSX models, including Base and T trims with both the 3.0L C30A and 3.2L C32B V6 engines (the 3.2L was introduced in the 1997 model year NSX-T and carried through 1999). The specific position is Bank 2 Sensor 2, the downstream rear sensor. The NSX is a V6 engine mounted longitudinally with two banks, each with its own upstream and downstream sensor. The 24061 covers Bank 2 downstream only. The upstream sensors for the NSX use different NTK part numbers and are not covered by this listing. Science of Speed, a specialist in NSX parts, specifically notes that NTK is the OEM supplier for NSX oxygen sensors, making the 24061 the factory-equivalent replacement for this position.

How many wires does the 24061 have, and why does wire count matter?
The 24061 is a 4-wire heated oxygen sensor. The four wires consist of two heater circuit wires (which power the internal heating element to bring the sensor to operating temperature quickly) and two signal wires (which carry the voltage output to the ECU). A 4-wire heated sensor is not interchangeable with a 1-wire or 2-wire unheated sensor. Attempting to install a sensor with the wrong wire count will result in a mismatched connector and a non-functional or incorrectly signaling sensor. All covered 1995-1999 applications require a 4-wire heated sensor in this position.

Can I install the 24061 myself, or do I need a shop?
Oxygen sensor replacement is one of the more approachable DIY repairs for someone with basic mechanical experience and a few hand tools. You will need a 7/8 in. (22 mm) oxygen sensor socket or box wrench, a ratchet and extension, penetrating oil (the sensor may be seized if it has never been removed), and a torque wrench. The 24061 includes anti-seize on the threads. Disconnect the electrical connector, unscrew the old sensor, install the new one, and reconnect the harness. Torque to approximately 33 ft-lbs (44 Nm), which is standard for M18 x 1.5 oxygen sensors. Clear any stored fault codes after installation.

Access difficulty varies: the Odyssey and Oasis downstream sensor is generally accessible from underneath with the vehicle on jack stands, while the NSX Bank 2 downstream sensor requires working around the mid-engine layout and is somewhat more involved.

What is the difference between the 24061 and the Denso 234-4092? Which is better?
Both the 24061 (NTK) and the Denso 234-4092 are OEM-caliber sensors for the same downstream applications. NTK is the OEM oxygen sensor supplier to Honda and Acura for many platforms including the NSX, while Denso is also a major OEM supplier to Honda. Both are manufactured in Japan to OEM standards. The 24061 uses NTK's proprietary 3-stage plasma jet overcoat and dual-coated platinum element, which NTK markets as providing additional contamination resistance. Either sensor is a legitimate OEM-grade replacement. The NGK24061 is priced at the top of the market for this application, reflecting its OE-supplier pedigree and NTK's manufacturing quality, not a premium over equivalent performance.