Parts for your 2007 Lexus Is-Knock sensor

2007 Lexus IS knock sensor — fitted from factory and worth a look

Based on Lexus/Toyota technical sources — the factory Repair Manual for the 4GR‑FSE and 2GR‑FSE engines (MY2006–2012), the Lexus/Toyota Electronic Parts Catalogue, and the OEM DTC list for GR‑FSE engines — the 2007 Lexus IS250 and IS350 are fitted with knock sensors. These manuals outline diagnostics for DTCs P0325–P0333 and show two block‑mounted knock sensors under the intake manifold, used by the ECU to control ignition timing. So yes, the knock sensor is relevant on a 2007 Lexus IS (petrol V6 models).

On a 2007 Lexus IS, the knock sensor is there to “listen” for detonation (pinging) and let the ECU pull timing before anything nasty happens. It’s a clever bit of insurance that keeps the V6 running sweet on Aussie/NZ fuels and changing conditions. When the sensor hears the tell‑tale vibration of knock, the ECU trims spark advance cylinder‑by‑cylinder to protect the engine and keep performance tidy.

It’s not really a routine service item, but it does deserve attention as these cars rack up the kilometres. The sensor lives in the V of the engine block beneath the intake manifold, so access is a bit of a mission under the bonnet. If there’s a Check Engine light with codes like P0325, P0327, P0328, P0330, P0332 or P0333, or if there’s audible pinging, dull performance or rough running on light throttle, it’s time to diagnose. Start with basics: correct fuel (at least 95 RON is a safe bet), no vacuum leaks, and good ignition components.

When fault‑finding, a smart approach is:

• Scan for codes and look at live data (knock retard, fuel trims).
• Inspect the knock sensor loom and connectors for oil/coolant ingress, brittle sheathing, or poor grounds.
• Check intake gaskets and PCV plumbing while you’re there.

If replacement is needed, use quality OEM‑equivalent sensors and new gaskets. The job usually involves removing the intake manifold, that’s a good time to refresh coolant hoses in the V, the PCV valve, and the manifold gaskets. Fit the sensors with the correct orientation and torque as per the Lexus Repair Manual, route the harness exactly as shown to avoid false noise pickup, clear the codes, and complete a proper warm‑up and road test. Many owners choose preventive replacement once the manifold is off on high‑km cars, simply to avoid doubling up on labour down the track. Look after the wiring, run decent petrol, and the ECU plus those two little piezo mics will keep the IS purring happily.

Popular questions about 2007 Lexus IS knock sensors

Where is the knock sensor on a 2007 Lexus IS?
On the petrol V6 IS250/IS350, there are two knock sensors bolted to the engine block in the V valley, directly under the intake manifold. The harness runs up to the engine loom near the manifold. Access requires removing the intake manifold, so it’s not a quick driveway peek.

How do you tell if a knock sensor is failing?
Common signs include a Check Engine light with codes like P0325–P0333, noticeable pinging under load, flat or inconsistent power, and poor fuel economy. Because other issues can mimic knock, it’s best to scan live data, check fuel quality, and inspect wiring/connectors before condemning the sensor itself.

Can a knock sensor be cleaned or should it be replaced?
The sensor itself isn’t serviceable, but the connector and harness can be cleaned and repaired if they’re the culprit. If the sensor is out of spec or flagged by the proper diagnostics, replace it with a quality unit and follow the factory installation procedure and torque spec.