2PCS for 2006-2015 Honda Civic 1.8L L4 Upstream+Downstream Oxygen O2 Sensor 234-9124

Overview

In the exhaust of a Honda Civic with the 1.8L four cylinder, this pair of oxygen sensors reports burn quality back to the engine computer. One goes ahead of the catalytic converter and one behind it, and both plug in.

Replacing both sensors together suits a Civic that is throwing oxygen sensor codes or has run long on the originals. The listing carries no thread size or wire length, so the plug and the reach need checking against the old parts.

Who it's for

A Civic in the stated model years that needs both exhaust sensors renewed is the intended setting. Owners of other Honda models or engines should not rely on this set.

Pros and cons

Performance notes

Each sensor sends an electrical signal that changes with the oxygen in the exhaust, which the engine computer reads to trim fuel. The upstream sensor guides the mixture and the downstream one checks the catalytic converter, so each must sit in its own position.

Specifications