Parts for your 2008 Honda Elysion-Knock sensor

2008 Honda Elysion knock sensor — fitted, what it does, and when to replace it

Yes, a knock sensor is fitted and relevant on the 2008 Honda Elysion. This applies to both engine families offered in that model year: the 2.4‑litre K24A inline‑four and the J‑series V6 (J30A/J35A, depending on trim). Technical sources that show this include: Honda Electronic Parts Catalogue (Japan) for Elysion RR1/RR2/RR3 (lists a “Knock Sensor” on the cylinder block, typical part numbers shown for this platform include 30530‑PNA‑003 for K‑series and 30530‑P8E‑A01 for J‑series), the Honda Workshop Manual/PGM‑FI section referencing knock sensor diagnostics and DTCs P0325–P0330, and engine control descriptions noting ignition timing correction via knock sensing.

The knock sensor on a 2008 Honda Elysion is a small, block‑mounted microphone of sorts. It “listens” for detonation (pinging) and lets the ECU trim ignition timing to keep the engine smooth, efficient, and protected. On the road that means better fuel economy, crisp performance, and fewer nasty rattles under load—especially on hot days or when running ordinary 91 RON petrol.

Over time, heat and vibration can fatigue the sensor or its loom. Common signs of trouble include a Check Engine light with codes like P0325, sluggish acceleration, increased fuel use, or audible pinging on hills. On the K24A, the sensor sits on the back of the block below the intake, on the J‑series V6 it’s tucked in the valley under the intake manifold. Either way, access isn’t terrible but it can be fiddly under the bonnet.

It’s not a scheduled replacement item, so it’s typically replaced only when faulty. During regular servicing, it’s smart to eyeball the connector for corrosion or oil contamination, and make sure the harness isn’t chafed. If replacement is needed, use a quality OEM‑equivalent sensor, install it clean and dry (no thread sealant), and tighten to the service‑manual spec (around the mid‑20s N·m, depending on engine). Over‑torque can crack the piezo element, under‑torque can dull sensitivity. After refit, clear codes and perform an idle learn so the ECU can settle in.

A competent DIYer can usually handle the K24A swap with basic tools, the V6 may need the intake off, so allow more time. To help the sensor do its job long‑term, stick to the fuel grade recommended in the owner’s handbook, many JDM V6 variants are happier on premium (95–98 RON). Keeping the cooling system healthy and the air filter clean will also minimise knock and reduce how hard the sensor has to work.

• Technical references used: Honda EPC (Elysion RR1/RR2/RR3, 2008 model year), Honda Workshop Manual/PGM‑FI diagnostics (Knock Sensor circuit and DTC P0325–P0330), Honda engine control descriptions for K24A and J‑series V6.

FAQ

Where is the knock sensor on a 2008 Honda Elysion?
The 2.4‑litre K24A has the sensor on the back of the block beneath the intake manifold area. The J‑series V6 positions it in the engine’s valley under the upper intake. Access ranges from tight but doable (K24A) to intake‑manifold‑off territory (V6), so labour time varies.

What symptoms or codes point to a bad knock sensor?
Expect a Check Engine light with codes like P0325 (Knock Sensor Circuit) or related variants, plus dull performance, elevated fuel use, or pinging under load. Wiring damage or a loose sensor can mimic the same faults, so inspection is worthwhile before buying parts.

Does the knock sensor need routine replacement?
No. It’s replaced on condition. During services, checking the connector and loom for damage and keeping oil leaks at bay is usually enough. If it does fail, fitting a quality sensor and torquing it correctly restores proper knock control.