Oxygen (O2) Sensor for Honda Civic 1.8L — Upstream and Downstream Replacement
A replacement heated oxygen sensor for the 1.8L Honda Civic, available in upstream (pre-catalyst) and downstream (post-catalyst) positions. Cross-references 234-9124, 234-4350, 36531-RNA-A01 and 36532-RNA-A01.
Key Features
- Upstream and downstream options
- Direct-fit connector on the listed part numbers
- Heated sensor
Before you order
Choose upstream or downstream carefully — they are not interchangeable, and check your car's exact year and engine against the part numbers above. Compare the connector and cable length to the sensor you are removing.
A fault code pointing at an oxygen sensor does not always mean the sensor is bad. Exhaust leaks, a failing catalytic converter and wiring faults set the same codes. Diagnose before replacing.
Trademark notice
Honda is a trademark of its owner. This is an aftermarket replacement part, not a genuine Honda part, and is not made by, sold by or endorsed by Honda. The OE numbers are listed only to identify fitment.
This is an emissions-related component. It must be a functioning sensor fitted in its correct position — do not use spacers, defeat devices or non-functioning substitutes, which are illegal for road vehicles in most countries.
