ACAUTO Oxygen O2 Sensor Pair for Honda Civic & Accord — Upstream/Downstream Set, Heated OEM-Fit 234-4092/234-4123

ACAUTO Oxygen O2 Sensor 234-4092/234-4123 is a direct-fit upstream and downstream replacement designed to restore accurate air-fuel monitoring on compatible Honda and related models.

This pair of oxygen sensors from ACAUTO includes both upstream and downstream units built to match OEM fitment and electrical connections for a range of late-1990s and early-2000s Honda vehicles. Each sensor uses robust materials and an integrated heater so the module reaches operating temperature quickly, giving the engine control unit reliable oxygen readings. The set replaces several OE part numbers to simplify sourcing and comes pre-treated on the threads for easier installation.

Which vehicles and engines will these ACAUTO sensors fit?

These sensors are intended for specific Honda platforms and model years with listed engine codes—check the vehicle application before purchasing. Compatible cars include Civic, Accord, Prelude, Odyssey, CL, TL, NSX and Oasis across various years and engine sizes noted in the compatibility list. Use the OE numbers and engine code to confirm match with your vehicle.

• Civic L4 1.7 (D17A7) — 2001–2005
• CL V6 3.2, TL V6 3.2 — select years 1997–2003 (see fitment specifics)
• Accord V6 3.0, Prelude L4 2.2, Odyssey L4 2.2/2.3 — select late‑90s to early‑2000s models
• NSX V6 3.2 and Isuzu Oasis variants — verify year/engine before ordering

How does the ACAUTO sensor ensure accurate readings and durability?

Precision materials and construction are chosen to provide consistent oxygen measurement and long service life. The sensing element uses platinum and ceramic substrates, while the housing employs stainless steel for corrosion resistance. Those choices help the sensor tolerate exhaust conditions and maintain consistent output for the vehicle’s engine control system.

• Platinum-coated sensing element for dependable signal generation
• Ceramic substrate for stable sensing characteristics
• 310S stainless steel housing for corrosion and heat resistance
• Quality-controlled assembly to reduce premature failure

What advantages does the fast-acting heater deliver in everyday driving?

The integrated heater shortens the time the sensor needs to reach its working temperature, so the engine control unit receives valid oxygen data sooner after startup. Faster warm-up improves closed-loop fuel control during the initial minutes of driving and can reduce rough idle or rich conditions that occur while a cold sensor is warming up. This feature is especially helpful in colder climates or frequent short trips.

• Heater brings sensor to operating temperature within seconds
• Improves fuel trim stability during warm-up phases
• Supports emissions control by reducing cold-start enrichment
• Applies to both planar and wire-thimble sensor types

Is installation straightforward for a home mechanic or shop?

ACAUTO sensors are built as direct-replacement parts with OE-style connectors and threads designed to match factory specifications. Each unit arrives with threads pre-coated with anti-seize to simplify removal later, and the harness plugs match factory sockets to avoid splicing or adapter requirements. Basic hand tools and an oxygen-sensor socket are usually all that’s needed for installation.

• Direct-fit OE-style electrical connections—no splicing required
• Pre-applied anti-seize on sensor threads for easier future removal
• Compatible thread pitch and mounting flange for straightforward fit
• Sold as a set for upstream (pre-catalyst) and downstream (post-catalyst) replacement

Who this is for: This ACAUTO 234-4092/234-4123 O2 sensor pair is aimed at owners and technicians working on compatible Honda and related models who need a reliable, direct-fit replacement that restores proper oxygen sensing without wiring changes. It suits drivers experiencing fuel-trim trouble codes, poor fuel economy, or those performing preventative maintenance on emissions components. Confirm vehicle year, engine code, and OE cross-reference before purchase to ensure correct application.