HTMXJA Oxygen O2 Sensor Kit for 2003–2007 Honda Accord L4 2.4L — Upstream & Downstream Direct-Fit, Prewired

If your Accord is showing reduced fuel economy, rough idling, or a check engine light related to oxygen sensors, this HTMXJA kit provides direct-fit replacements engineered to match OEM specs. The pair includes one upstream (pre-cat) and one downstream (post-cat) sensor designed specifically for 2003–2007 Accord L4 2.4L engines. Each sensor is built from corrosion-resistant materials and prewired for an easier installation compared with generic aftermarket units.

How will these O2 sensors affect my Accord’s performance?

Oxygen sensors play an important role in helping the engine control module adjust air-fuel mixture for efficient combustion. Worn or failing sensors can cause higher emissions and poorer fuel economy; installing fresh sensors helps restore more accurate feedback to the engine computer. These HTMXJA sensors are calibrated to provide stable voltage and signal response similar to OE components.

• Restores accurate oxygen readings for the engine control unit.
• Improves fuel trim and can reduce fuel consumption variability.
• Helps the catalytic converter operate under correct conditions.

Will these fit my vehicle and match OEM part numbers?

This kit is specified for the Honda Accord model years 2003 through 2007 with the 2.4L L4 engine. HTMXJA lists compatibility with common reference numbers so you can confirm fit before ordering. The kit corresponds to OE numbers 234-9040 for the upstream sensor and 234-4797 for the downstream sensor, and cross-references other OEM codes for peace of mind.

• Direct fit for Accord 2003–2007 L4 2.4L engines.
• OE/Reference numbers: 234-9040 (upstream) and 234-4797 (downstream).
• Cross-references include 13704, 2344363, 36531RAAA01, 36532RAAA11, and more.

How difficult is installation and what should I expect?

HTMXJA sensors are manufactured to OEM dimensions so they install without modifications in most cases. Basic hand tools are usually sufficient, though an oxygen sensor socket or wrench will make removal and installation easier. If you’re replacing both sensors at once, labor time is reduced and electrical connectors are designed to match factory harnesses to minimize hassle.

• Plug-and-play connectors compatible with factory wiring harnesses.
• Standard sensor thread and heat shield for straightforward fitment.
• Recommended tools: O2 sensor socket, ratchet, penetrating oil for stubborn threads.

What warranty and quality assurances come with the kit?

HTMXJA provides a six-month warranty covering defects and manufacturing faults, allowing you to verify fit and function after installation. Sensors are constructed from corrosion-resistant materials and undergo basic quality checks to ensure consistent signaling. Always verify OE numbers and vehicle compatibility before purchase to avoid returns.

• Six-month limited warranty against manufacturing defects.
• Manufactured materials designed for environmental durability.
• Shipped as a matched upstream and downstream set for consistent operation.

Who is this for: This HTMXJA two-piece O2 sensor kit is intended for owners and mechanics of 2003–2007 Honda Accord vehicles with the 2.4L L4 engine who need direct-fit upstream and downstream replacements that match OEM references. It’s suitable for DIYers comfortable with basic under-vehicle work and professional shops seeking a cost-effective OE-compatible replacement set.