Torque Shop

What is a knock sensor and where is it situated?

A knock sensor detects the sound made by the engine when the octane level of the petrol it is burning is too low for any given operating condition.

Knocking occurs when the fuel-air mixture ignites prematurely.

The car's electronic control module uses this information to adjust the engine spark timing to compensate for this.

The knock sensor is located on the top rear of the engine, behind and under the intake manifold.


A version of this article appeared in the print edition of The Straits Times on January 30, 2016, with the headline 'TorqueShop'. Print Edition | Subscribe