Upstream and Downstream Oxygen O2 Sensor for 2008-2012 Accord

In this review the focus is on whether this pair of upstream and downstream Oxygen O2 sensors is a practical replacement for Honda Accord (2008-2012) and TSX (2009-2014) models with the 2.4L L4 engine. The bottom line: this kit is aimed at DIY owners and independent mechanics who want a direct-fit, OEM-referenced replacement that can restore emissions monitoring and improve fuel trim when it works correctly. It installs without modification and matches common OE part numbers, making it a straightforward option for those who need both sensors at once.

Key Features

• Direct fitment: Packaged for Accord 2008-2012 and TSX 2009-2014 L4-2.4L, so buyers can expect straightforward compatibility when OE numbers match.
• Upstream and downstream pair: Includes the upstream sensor with reference 2349091 and the downstream with reference 2344462, allowing full replacement of both monitoring positions.
• OE reference numbers provided: Lists multiple cross-reference part numbers, helping confirm fitment against factory and aftermarket catalogs.
• Fuel and emissions benefit: A functioning sensor helps the engine management monitor exhaust oxygen and can improve fuel efficiency and emissions control.
• Easy to install: Built to OEM-like dimensions and connectors so most owners or technicians can install without modifications.
• Warranty support: Comes with a six-month warranty, offering limited reassurance against early failures.

Who It's For

This pair is best for Honda owners of Accord 2008-2012 and TSX 2009-2014 with the 2.4L L4 engine who need both upstream and downstream oxygen sensors replaced at once. It suits DIYers comfortable verifying OE numbers and performing an undercar repair or an independent shop that prefers a low-cost, direct-fit replacement option.

It is less appropriate for buyers who expect premium branded sensors with extended warranties or for vehicles with different engine codes; always confirm OE numbers before purchasing. Drivers who repeatedly see a check engine light after replacement should consider professional diagnostics rather than repeated sensor swaps.

Pros & Cons

Pros

• Direct-fit design with listed reference numbers makes compatibility checks simple.
• Replacing faulty sensors can restore correct fuel trims and reduce emissions when the sensors operate properly.
• Sold as a matched upstream/downstream set, which is convenient when both are due for replacement.

Cons

• Customer feedback is mixed; some reported the check engine light returning, indicating occasional reliability variation.
• Six-month warranty is shorter than some OEM or premium aftermarket alternatives.

Specifications

Fitment	Accord 2008-2012 L4-2.4L; TSX 2009-2014 L4-2.4L
Upstream Part Number	2349091 (234-9091)
Downstream Part Number	2344462 (234-4462)
Cross Reference Numbers	36531-R40-A01, 36532-R40-A01, 211200-2758, 211200-2750
Included Items	Upstream sensor and downstream sensor (pair)
Warranty	Six-month warranty

Our Verdict

The upstream and downstream oxygen sensor pair is a practical, value-focused option for Honda Accord and TSX owners who need a direct replacement that matches common OE references. It offers easy installation and the chance to restore correct emissions monitoring and fuel economy, but buyers should accept that results can vary and the warranty is limited compared with premium parts.

Frequently Asked Questions

Will these sensors fit my vehicle?
Confirm your vehicle model year and OE part numbers against the listed references to ensure correct fitment.

Do they come with a warranty?
Yes, the sensors include a six-month warranty covering early defects.

Will replacing sensors fix a check engine light?
Replacing faulty oxygen sensors can clear codes tied to sensor failure, but persistent codes should be diagnosed to rule out wiring, exhaust leaks, or engine management issues.