O2 Oxygen Sensor Upstream Downstream 2Pcs 2.4L for 2003-2007 Accord

Our review of this 2-piece O2 oxygen sensor kit finds it best for DIY mechanics and independent shops who need a direct-fit replacement for Honda Accord models with the 2.4L L4 engine. The package contains both an upstream and downstream sensor, so it addresses common check-engine light triggers related to oxygen sensing and air-fuel ratio readings. Installation is straightforward for someone with basic tools, and the sensors are built with a double laser-welded stainless steel body intended to deliver consistent, precise measurement of oxygen partial pressure.

Key Features

• Complete kit: Includes one upstream and one downstream oxygen sensor so both positions can be serviced together for consistent performance.
• Direct fit: Supplied with OEM-referenced part numbers, which helps ensure compatibility with specified 2003-2007 Honda Accord trims and the 2.4L L4 engine.
• Durable construction: Double laser-welded stainless steel body increases resistance to heat and exhaust conditions for longer life.
• Improved engine control: Precise oxygen partial pressure measurement supports more accurate air-fuel ratio control and can help restore smooth running and fuel efficiency.
• One-year warranty: The included warranty gives short-term protection against early failures and provides buying confidence for replacements.

Who It's For

This kit is aimed at owners of 2003-2007 Honda Accord DX, EX, LX or SE trims with the 2.4L L4 engine who want a matched upstream and downstream replacement set. It is also well suited to independent repair shops that prefer to replace both sensors at once to avoid repeated diagnostics and labor.

Those who should look elsewhere include owners of non-Honda vehicles or Accords with engines other than the 2.4L L4, and drivers who require OEM-branded parts from a dealer for warranty or service history reasons.

Pros & Cons

Pros

• Includes both upstream and downstream sensors for a complete repair in one purchase.
• Constructed with double laser-welded stainless steel for durability in exhaust environments.
• Lists multiple OEM part numbers for cross-reference and fitment assurance with specified Accord models.

Cons

• Not an OEM branded part, so some buyers preferring dealer original parts may avoid it.
• Availability of model-specific connectors or harness adapters is not specified, so check fit before purchase.

Specifications

Kit contents	2 PCS: upstream and downstream oxygen sensors
Compatible models	Honda Accord DX/EX/LX/SE 2003-2007 (selected trims)
Engine fit	L4 2.4L
Construction	Double laser-welded stainless steel body
Included warranty	1 Year
OEM reference numbers	234-4797, 234-9040 and related OEM codes

Our Verdict

This two-piece oxygen sensor kit is a practical, cost-effective replacement for Accord owners with the 2.4L engine who need both upstream and downstream sensors. With durable stainless steel construction and OEM cross-reference numbers, it delivers reliable fitment and improved air-fuel control, making it a sensible value for DIY repairs and independent shops.

Frequently Asked Questions

Will these sensors fit my 2005 Accord with a 2.4L engine?
Yes, the kit is listed for 2003-2007 Accord models with the L4 2.4L engine and includes OEM reference numbers to confirm fitment.

Are both sensors included in the box?
Yes, the package contains one upstream (234-9040) and one downstream (234-4797) oxygen sensor for a complete replacement.

Is there a warranty?
Yes, the sensors come with a 1 year warranty against early defects.