Overview

This pair covers both oxygen sensors on the 1996-2000 Honda Civic 1.6L — the upstream sensor ahead of the catalytic converter and the downstream sensor behind it. On a car this age, both sensors are usually the originals: the upstream element wears sluggish and the fueling goes rich, the downstream signal drifts and the ECU starts questioning the converter. The usual symptoms are a check engine light, worse fuel economy, a lazy throttle and a failed emissions test. Replacing both at once makes sense — they have been working the same number of miles, and the labor overlaps.

Vehicle fitment & specifications

Features

Upstream sensor
Detects the air-fuel ratio of the engine across different operating conditions and feeds it back to the ECU, so fueling stays where it should be.

Downstream sensor
Monitors whether the catalytic converter is working as it should, and helps catch a failing converter before the problem gets expensive.

What a healthy pair does
Correct sensor signals support lower harmful emissions, better fuel economy, steadier engine performance, and help prevent premature failure of the catalytic converter.

Checked before shipping
Every sensor is tested before it ships to make sure the output matches the parameters listed for your vehicle.

Fitment check

Listed for the 1996-2000 Honda Civic trims and engine codes in the table above. This set is engine-specific, so check your engine code before ordering — it is on the emissions label under the hood and stamped on the block.

What's in the box

• 1 upstream oxygen sensor
• 1 downstream oxygen sensor

FAQ

Why replace both sensors at once?
Both sensors have been in service the same number of miles, so when one is worn the other is not far behind. Doing both in one job saves a second round of labor and gives the ECU a matched pair of signals to work from.

Will this fit my Civic Si?
The Si is not in the fitment list above. This set is engine-specific, so verify your engine code against the table before ordering.

How do I find my engine code?
Check the emissions label under the hood, or the code stamped on the engine block. The table above covers the D16Y7 and D16Y5 engines.

Where does each sensor install?
The upstream sensor threads into the exhaust ahead of the catalytic converter; the downstream sensor sits behind it. Positions match the factory locations.

Will replacing the sensors turn off my check engine light?
If the code points at a worn sensor, replacing it addresses the cause and the light clears after the ECU re-checks. If the code comes back, the fault is elsewhere — wiring, an exhaust leak or the converter itself — and the code needs to be read before parts are replaced.