Checking / removing and installing the lambda probe (Mazda Familia BG)

The lambda probe is used to regulate the composition of exhaust gases on cars with gasoline engines with a regulated catalyst. The probe is screwed into the exhaust manifold.

Attention! Lambda probe connection cables must not be repaired or soldered. If the cable is damaged, replace the lambda probe as a set.

Examination

1. Warm up the engine, the coolant temperature gauge arrow should be in the middle of the scale.

2. Leave the engine running at idle speed.

3. Disconnect the electrical connection and connect a voltmeter between the lambda probe contact and the vehicle ground.



4. At 3000 rpm the voltage should be approximately 0.55 V, to do this give a little gas with the throttle lever.

5. Several times quickly increase the number of revolutions and let it decrease. When the number of revolutions increases, the voltmeter should show a voltage of 0.5 to 1.0 V, when the number of revolutions decreases, from 0 to 0.4 V, otherwise the lambda probe should be replaced. (The sensitivity can be checked in the workshop using a diagnostic device).

Removal

1. Disconnect the plug.



2. Unscrew the lambda probe on the exhaust manifold and remove it with the gasket. If necessary, first unscrew the heat shield.

Installation

MAZDA 323 4 WD (all wheel drive)

lubricate (high temperature grease)

Attention! When replacing, use only the same type of lambda probe.

1. Clean the threads.

2. Apply special BOSH grease to the threads of the lambda probe only. New probes are already coated with this grease. The grease should not get on the splines or holes of the sensor body. If possible, do not touch the body of the new lambda probe or dirty it.

Attention! If the sensor is screwed in without a special high-temperature paste, over time the thread will become firmly welded and the lambda probe will not be able to be unscrewed.

3. Screw in the lambda probe with the gasket and tighten it with force 40 Nm.

4. Connect the plug to the lambda probe.