Parts for your 2015 Toyota Hilux-Knock sensor

2015 Toyota Hilux knock sensor — what it does, and whether your ute has one

Whether a 2015 Toyota Hilux uses a knock sensor depends on the engine fitted. Technical documentation shows knock sensors are used on the petrol models, but not on the diesel variants. Toyota’s 2015 Hilux repair information for the 2TR‑FE (2.7L petrol) and 1GR‑FE (4.0L V6 petrol) lists a “Knock Sensor” and related diagnostic trouble codes (e.g., P0325/P0330). The Toyota Electronic Parts Catalogue also lists a “Sensor, Knock” for GGN- and TGN‑series petrol Hilux, while KUN‑series diesel (2KD‑FTV 2.5L and 1KD‑FTV 3.0L) control systems do not include a knock sensor in their sensor suite. Toyota diesel engine control literature for 1KD‑FTV details timing and combustion control via crank/cam position, boost, fuel pressure and temperature sensors, without knock sensing. These sources indicate: petrol 2015 Hilux — knock sensor fitted, diesel 2015 Hilux — knock sensor not used.

For owners of petrol 2015 Hilux models, the knock sensor is a quiet hero. It “listens” for pinging (detonation) in the engine and lets the ECU trim ignition timing on the fly. That keeps the 2.7 or V6 running crisply on Aussie and Kiwi fuels, whether cruising, towing up an alpine pass, or slogging in summer heat. By catching knock early, it protects pistons and valves, smooths the idle, and can even help fuel economy by allowing the ECU to run as much timing advance as conditions allow.

It’s not a routine service item like oil or filters, but it deserves a look whenever the intake is off or during a major service. A crook knock sensor or a damaged loom will usually trigger a check‑engine light and leave the ute feeling a bit doughy because the ECU plays it safe with reduced timing. Other signs can include rattly “ping” under load, higher fuel use, or inconsistent power.

• Inspection tips: Check the connector and wiring for brittleness or oil intrusion. On the V6, the sensors live in the “V” under the intake, on the 2.7, the sensor mounts to the side of the block.
• Replacement advice: Use a quality sensor and a fresh washer if specified. Mount to a clean, dry surface and tighten to the factory spec so vibrations transmit properly. Don’t over‑tighten.
• After the job: Clear fault codes, and allow the ECU to relearn with a varied drive — gentle cruise, then some steady hill work.

Why diesels don’t use one on this model year: diesel combustion is governed by injection timing/pressure and air management rather than spark timing. The 2015 Hilux diesels monitor crank/cam position, boost, rail pressure, air and fuel temps, and use those inputs to control combustion — a classic knock sensor isn’t part of that strategy.

Technical sources referenced: Toyota Hilux 2015 Repair Manual (Engine Control — Knock Sensor, DTC P0325/P0330) for 2TR‑FE and 1GR‑FE, Toyota Electronic Parts Catalogue listings for “Sensor, Knock” on petrol VIN frames (TGN/ GGN) and absence on diesel VIN frames (KUN), Toyota 1KD‑FTV Diesel Engine Control System documentation (sensor list excludes knock sensor).

FAQs

Where is the knock sensor on a 2015 Hilux?
On petrol models, the 2.7L (2TR‑FE) typically has one sensor on the side of the block, while the 4.0L V6 (1GR‑FE) uses two sensors tucked in the “V” under the intake manifold. Diesel 2015 Hilux variants don’t have a knock sensor.

Can a faulty knock sensor harm the engine?
If the sensor or wiring fails on a petrol Hilux, the ECU dials back timing to protect the engine, so it’s usually safe to drive but a bit sluggish. Ignore persistent pinging or a check‑engine light, though, and you risk long‑term damage under heavy load. Best bet: diagnose and sort it promptly.

Do 2015 Hilux diesels use a knock sensor?
No. The diesel control system manages combustion through injection timing, pressure, and airflow sensors, so there’s no conventional knock sensor on the 2KD‑FTV or 1KD‑FTV engines used in 2015.