Parts for your 2020 Toyota Hilux-Knock sensor

2020 Toyota HiLux knock sensor: what it does, why it matters, and how to look after it

Based on Toyota’s technical literature for the N80 HiLux (2015–2020)—including the Repair Manual, New Car Features (NCF), and the Electrical Wiring Diagram (EWD)—the 2020 Toyota HiLux is fitted with a knock sensor. The documents show a knock sensor input to the engine control module on both GD-series diesels (1GD-FTV 2.8L and 2GD-FTV 2.4L) and the 2TR-FE 2.7L petrol, mounted to the cylinder block and used for combustion knock control and timing optimisation. Toyota’s Electronic Parts Catalogue for the same model series also lists a knock sensor for these engines.

The knock sensor on a 2020 HiLux is there to listen for the specific vibration “ring” of abnormal combustion. On the petrol 2.7 it helps the ECU dial back ignition timing if the engine starts to ping, protecting the pistons and keeping things smooth under load. On the 2.8 and 2.4 GD diesels it’s used to manage combustion noise and fine‑tune injection timing, which trims harshness and can improve efficiency. It’s a quiet achiever—most owners never notice it doing its job, and that’s exactly the point.

It’s not a routine service item, but it does deserve a bit of attention when you’re under the bonnet. During major services or if a warning light pops up, a tech will usually scan for knock sensor codes (think P0325/P0327 types), check the harness for rub‑through, oil ingress or brittle insulation, and make sure the connector lock is positive. If the intake’s off for other work, it’s a good moment to visually inspect the sensor on the block and confirm it’s torqued to the workshop manual spec—over‑ or under‑tightening can mess with readings.

Replacement is straightforward for a pro: disconnect the battery, access the sensor (often beneath or beside the intake manifold on these engines), swap it out, torque to spec, clear codes and carry out any ECU relearn or road test to verify knock control is active. Use quality fuel—correct octane for the petrol, clean diesel for the GD—because poor fuel can trigger harsh combustion that keeps the knock strategy busy. Avoid blasting the engine bay with a pressure washer, water in the loom or connector is a common culprit for intermittent knock sensor faults. Treated right, the sensor should last the life of the vehicle, but if it does fail, fixing it promptly protects your HiLux from detonation damage and restores full performance.

• Typical signs of trouble: check engine light, rattly “ping” under load, sluggish performance, or higher fuel use.
• Best practice: inspect wiring at major services, and always torque the sensor to spec if it’s been removed.

Popular questions

Does the 2.8 GD diesel in a 2020 HiLux have a knock sensor?
Yes. Toyota’s N80 HiLux technical docs (NCF, EWD and Repair Manual) show a knock sensor on the 1GD‑FTV 2.8L diesel. It feeds the ECU with combustion feedback so injection timing and noise control can be fine‑tuned, improving refinement and protecting the engine under varying loads and fuel qualities.

What are the symptoms of a bad knock sensor on a 2020 HiLux?
Expect a check engine light and stored knock‑sensor circuit codes. The ute may feel flat, use more fuel, or ping/knock under load. Sometimes it’s the wiring or connector rather than the sensor itself, so a quick visual and a scan with live data is the smart first step.

Should the knock sensor be replaced as part of regular servicing?
No, it’s not a scheduled replacement item. During major services, it’s worth checking the harness and connector condition and ensuring correct torque if it has been disturbed. Replace the sensor only if it’s faulty or contaminated, then clear codes and verify knock control on a road test.