Parts for your 2008 Honda Cr-v-Oxygen sensor

2008 Honda CR‑V Oxygen Sensor: what it does and when to replace it

The 2008 Honda CR‑V absolutely uses oxygen sensors. Technical documentation backs this up: the Honda CR‑V 2007–2011 Factory Service Manual (Fuel & Emissions, PGM‑FI) specifies two sensors — an upstream air‑fuel ratio (A/F) sensor and a downstream heated oxygen sensor (HO2S). Honda’s parts catalogues list both for the 2.4‑litre petrol model, and OBD‑II requirements under ADR 79/02 for Australia and New Zealand mandate pre‑ and post‑catalyst sensors on petrol vehicles of this era. So yes — they’re fitted and they matter.

On the 2008 CR‑V, the A/F sensor (Sensor 1) sits in the exhaust manifold and continuously measures oxygen content so the ECU can fine‑tune fuel trims and keep the mixture near stoichiometric for smooth running and low emissions. The downstream O2 sensor (Sensor 2) lives after the catalytic converter and largely monitors catalyst efficiency. Together they help the CR‑V start clean, run economically, and pass WOF/rego emissions checks.

While oxygen sensors aren’t a typical “every‑service” item, they do wear out. Many owners see gradual degradation around 160,000–200,000 km. If the CR‑V shows a check engine light (common codes include P0134, P0135, P0141, P0137), drinks more fuel than usual, idles roughly, or smells rich, it’s time for diagnosis. An exhaust leak ahead of the sensors can also trigger odd readings, so rule that out first.

• Replacement tips: use quality sensors (OE Honda, Denso, or NTK), match connector types, and follow the factory tightening spec. Most new sensors arrive with the correct thread compound — don’t add extra goop and never touch the sensing tip.
• Removal help: a proper O2 sensor socket, penetrating oil, and a warm (not hot) exhaust make life easier. If the original is seized, take care not to twist the harness.
• After install: clear codes, verify live fuel trims, and complete a short drive cycle to let the ECU relearn. If a heater‑circuit code returns immediately, check the fuse and wiring before blaming the new sensor.

Looking after the oxygen sensors helps the catalytic converter live longer and keeps fuel economy in check. During routine servicing, a quick scan of fuel trims and a visual check of the sensor wiring and exhaust for leaks is a smart move for any 2008 CR‑V.

Popular questions about 2008 Honda CR‑V oxygen sensors

How many oxygen sensors does a 2008 Honda CR‑V have and where are they?
It has two. Sensor 1 is a wideband A/F sensor in the exhaust manifold (upstream). Sensor 2 is a conventional heated O2 sensor after the catalytic converter (downstream) in the front pipe. Being an inline‑four, it’s Bank 1 only.

When should the oxygen sensors be replaced?
There’s no strict interval, but many are tired by 160,000–200,000 km. Replace if there are fault codes, poor economy, rough running, or failed emissions. Proactive replacement of the upstream A/F sensor at high kilometres can sharpen fuel trims.

Is it okay to keep driving with a bad oxygen sensor?
It’ll usually run, but it may go rich or lean, burn more fuel, and risk catalytic converter damage. It can also trigger a failed WOF/rego. Short trips to the workshop are fine, don’t leave it for weeks.