A detonation sensor attached to the top of the cylinder block in the area between the 2nd and 3rd cylinders detects abnormal vibrations (detonation shocks) in the engine

The sensitive element of the detonation sensor is a piezocrystalline plate

During detonation, voltage pulses are generated at the sensor output, which increase with increasing intensity of detonation shocks.

The ECU adjusts the ignition timing according to the sensor signal to eliminate detonation flashes of fuel.

Replacing the Mazda 6 engine detonation sensor

Removing the decorative engine cover

Replacing the Mazda 6 engine detonation sensor

Click on the lock of the detonation sensor wire pads and disconnect the pad from the sensor

Replacing the Mazda 6 engine detonation sensor

We remove the intake manifold of the engine, as indicated in the article "Replacing the gaskets of the intake and exhaust manifold of the Mazda 6 engine"

Replacing the Mazda 6 engine detonation sensor

Unscrew the bolt of the detonation sensor attachment

Removing the detonation sensor

Installing the sensor in reverse order