Parts for your 2008 Honda Elysion-Oxygen sensor

2008 Honda Elysion oxygen sensor – what it does and when to replace it

Yes, the 2008 Honda Elysion uses oxygen-sensor technology. Honda’s own service literature for the Elysion (RR1–RR4, PGM-FI fuel and emissions sections) and Honda EPC listings show an upstream Air–Fuel (A/F) ratio sensor and a downstream heated oxygen sensor (HO2S). On the 2.4‑litre K24A there are two sensors (pre‑cat A/F and post‑cat O2). On the V6 models (J30A/J35A, including VCM variants) there are typically four sensors (one A/F and one O2 per bank). These are also required by JOBD/OBD monitoring used in Japan for 2000s Hondas.

The oxygen sensor setup is there to help the Elysion’s ECU trim fuelling in closed loop, keep emissions tidy, and protect the catalytic converters. The upstream A/F sensor is the precision unit that tells the ECU how rich or lean the burn is, so it can fine‑tune injection for smooth idle, decent power, and better fuel economy. The downstream O2 sensor mainly keeps an eye on catalytic converter efficiency, if the cat’s not doing its job, it flags a fault to save you from bigger dramas later.

While not a scheduled replacement item in Honda’s maintenance charts, these sensors are consumables. In Aussie and Kiwi conditions, many owners see original sensors taper off somewhere around 150,000–200,000 km. If fuel use climbs, the idle gets a bit lumpy, or the Check Engine lamp pops on with codes like P0134/P0135/P0141/P2A00, it’s time to test and likely replace. Stick with quality OEM‑equivalent parts (Denso/NTK), and avoid cheap no‑name sensors that can cause nuisance faults. When fitting, don’t twist the harness, use the pre‑applied anti‑seize on new sensors (most come coated), and tighten to the Honda spec in the service manual—over‑tightening can crack the bung or the sensor. After replacement, clear codes and run a proper drive cycle so the ECU can relearn and set readiness monitors.

• Typical signs of a crook sensor: higher petrol use, sulphur/sooty exhaust smell, sluggish response, rough cold start, failed WOF/rego emissions, and warning lights.
• Handy servicing checks: inspect wiring and plugs for heat damage, look for exhaust leaks ahead of the cat, and keep on top of air filter and plug condition so the sensors aren’t fighting a losing battle.

Look after the oxygen sensors and the Elysion will reward with smoother running, cleaner emissions, and fewer surprises at the bowser.

FAQs

How many oxygen sensors does a 2008 Honda Elysion have?
The 2.4‑litre K24A usually has two—one upstream A/F sensor and one downstream O2 sensor. V6 models (J30A/J35A) generally have two banks and therefore four sensors, one pair per bank. A quick check via the VIN in a parts catalogue or a peek under the car will confirm what’s fitted.

When should the oxygen sensors be replaced?
They’re typically replaced when fault codes appear or performance and economy drop off. Many owners choose preventative replacement around 160,000–200,000 km, especially if the originals are still in place. Testing with a scan tool and live data is the best way to confirm before spending on parts.

Can an oxygen sensor be cleaned instead of replaced?
Not really. Once the sensing element is contaminated or worn, cleaning won’t restore proper response. It’s better to fix any underlying issues (rich running, oil burning, exhaust leaks) and fit a quality replacement sensor.