Parts for your 2015 Honda Cr-v-Oxygen sensor

2015 Honda CR‑V Oxygen Sensor (O2/A/F Sensor): What It Does and When to Replace

Yes, the 2015 Honda CR‑V is fitted with oxygen-sensing hardware, and it’s absolutely relevant to how the engine runs. Technical sources including the Honda 2015 CR‑V Service Manual (PGM‑FI/ECM section), OEM parts catalogues for the K24W 2.4‑litre engine (Honda/DENSO/NTK listings), and ADR/Euro 5 emissions requirements all confirm the vehicle uses two sensors: an upstream wideband air/fuel ratio (A/F) sensor (Sensor 1, in the exhaust manifold) and a downstream oxygen sensor (Sensor 2, after the catalytic converter).

The upstream A/F sensor continuously measures oxygen content so the ECU can trim fuelling on the fly, keeping mixtures spot‑on for smooth running, strong economy, and low emissions. The downstream O2 sensor checks the catalytic converter’s efficiency. If the cat isn’t cleaning up properly—or the fuelling’s off—you’ll often see a check‑engine light and codes such as P0134, P0135 or P0420.

While they’re not a “service every time” item, these sensors are consumables. Many tech guides and supplier bulletins suggest inspection from around 120,000–160,000 kilometres, or sooner if symptoms show up. Using top‑tier fuel and fixing misfires quickly helps extend life.

• Common signs it’s time: increased fuel use, rough idle, flat spots, sulphur/sooty exhaust smell, failed emissions/WOF, or a check‑engine light.
• Best practice: use quality OEM‑equivalent sensors (DENSO/NTK are common on Honda), replace in pairs only if diagnostics point to both, and clear codes after repair.

Replacement advice for a 2015 CR‑V: let the exhaust cool, unplug the connector under the bonnet (upstream) or under the vehicle (downstream), use a proper O2 sensor socket and penetrating oil, and avoid contaminating the tip. Most new sensors come with the correct thread coating—skip extra anti‑seize unless the manufacturer specifies it. Torque to spec and route the harness exactly like factory to keep it off hot sections.

After fitting, perform an ECU/idle learn as Honda outlines in the service manual: warm the engine fully (radiator fan cycles), then let it idle with all accessories off for several minutes so fuelling trims settle. Done right, the CR‑V will cruise more efficiently, the catalytic converter will stay happier, and the check‑engine light will stay off.

How many oxygen sensors does a 2015 Honda CR‑V have?

It has two: an upstream wideband air/fuel ratio (A/F) sensor before the catalytic converter and a downstream conventional O2 sensor after the converter. The pair lets the ECU fine‑tune fuelling and verify catalytic converter performance.

What are the signs an oxygen sensor is failing on a 2015 CR‑V?

Expect poorer fuel economy, rough or hunting idle, hesitation, a sulphur smell, or a check‑engine light with codes like P0134/P0135/P0420. A scan tool showing lazy sensor response or stuck readings also points to a tired sensor.

Is it OK to keep driving with a bad O2 sensor?

Short trips might be possible, but it’s not ideal. A faulty sensor can cause rich running, which can damage the catalytic converter and cost more down the track. It’s best to diagnose and replace promptly.