SDYYDS O2 Sensor Kit for 2006–2015 Honda Civic 1.8L L4 — 2PCS Upstream & Downstream Direct Fit

If your Civic is showing a check engine light, rough idle, or reduced fuel economy, worn oxygen sensors are a common cause. This SDYYDS kit contains both the upstream (pre-catalytic) and downstream (post-catalytic) O2 sensors—part numbers 234-9124 and 234-4350—engineered for direct replacement on 2006–2015 Honda Civic models with the 1.8L L4 engine. Designed as plug-and-play units, they aim to match or exceed original equipment performance while simplifying installation and minimizing downtime.

How do these sensors affect my Civic’s performance?

Oxygen sensors measure exhaust oxygen levels so the engine control unit (ECU) can adjust fuel delivery. Faulty sensors can lead to inaccurate fuel trim, higher emissions, and degraded throttle response.

• Upstream sensor (234-9124) monitors exhaust before the catalytic converter for real-time air-fuel corrections.
• Downstream sensor (234-4350) verifies catalytic converter efficiency after the catalyst.
• Replacing both sensors at once helps the ECU relearn accurate fuel maps faster.
• Properly functioning O2 sensors support more stable idle and improved fuel economy.

Is installation difficult for a DIY mechanic?

Installation is intended to be straightforward: the SDYYDS sensors use a plug-and-play connector and standard thread sizes to match OEM mounting points. Basic hand tools and an O2 sensor socket are usually all that’s needed.

• Direct-fit connectors eliminate splicing or wiring modifications.
• Threaded housings match factory mounting locations for a secure fit.
• Typical install time: 30–90 minutes depending on access and tools.
• Follow torque specs and anti-seize guidance to avoid damage during installation.

What warranty and customer support come with this kit?

SDYYDS backs the kit with a one-year warranty and responsive customer service to resolve fitment or functionality questions. Support is available if you encounter issues during installation or the initial operation period.

• 1-year limited warranty covering manufacturing defects.
• Customer service response within 24 hours for troubleshooting and guidance.
• If a part is defective, SDYYDS provides replacement steps per warranty terms.
• Documentation and part numbers included for easy reference: 234-9124 (upstream), 234-4350 (downstream).

Which vehicles and part numbers does this kit fit?

This pair is made specifically for Honda Civic 1.8L L4 engines built between 2006 and 2015. Confirm fitment by matching your vehicle’s engine code and existing O2 sensor part numbers before ordering.

• Fitment: Honda Civic 2006–2015, 1.8L L4 engine models.
• Interchange numbers: 234-9124 (upstream) and 234-4350 (downstream).
• Intended as direct replacements for the factory sensors—no modifications expected.
• Check your vehicle’s VIN or service manual to verify compatibility.

Who is this for? This SDYYDS dual oxygen sensor kit is suited for Honda Civic owners and DIY mechanics who need a reliable, cost-effective replacement for aging O2 sensors on 2006–2015 1.8L L4 Civics. It’s also appropriate for service shops replacing both upstream and downstream sensors to restore accurate emissions readings and fuel control without wiring changes. If you want a plug-and-play solution with factory-style fit and one-year backing, this pair provides a practical option.