Contents: Removal ↡ Installation ↡
Cars with gasoline engines.
Depending on the engine type, the car may be equipped with one or two lambda probes, which regulate the CO content in the exhaust gases. One lambda probe is installed before the catalytic converter, and the second - after the catalytic converter.
Attention! The connecting wires of the lambda probes cannot be repaired or soldered. If the wire is damaged, the lambda probe must be replaced together with the wire.
Removal
Warning! Jacking up and supporting the vehicle on jack stands can pose a risk of injury. Read the safety precautions in the "Jacking up the vehicle" chapter.
1. Jack up the car and place it on jack stands.
Article text obtained from the website [MercedesMan.ru]
2. Disconnect plug 1 of lambda probe 2, releasing the wire from the mount (see illustration).
Attention! The illustration shows the lambda probe before the catalytic converter. If a second lambda probe is installed, it is removed in the same way.
3. Unscrew the lambda probe using a 22 mm wrench.
Installation
Attention! When replacing a lambda probe, purchase a probe of the same modification as the previous one.
4. Clean the lambda probe threads.
5. Apply a thin layer of special BOSCH grease to the threads of the lambda probe.
Caution! Do not allow grease to get into the slots or holes on the probe body. Do not touch the body of the new lambda probe to avoid contamination. New probes are supplied with a special grease applied.
Attention! When installing a lambda probe without high-temperature grease, it will eventually burn onto its seat and it will be almost impossible to unscrew such a probe.
6. Screw in the lambda probe and tighten it to 55 Nm.
Caution: A 22mm spanner and a torque wrench with a socket head are required to tighten the probe to the required torque.
7. Connect the probe wires, arranging them so that they do not fray, and secure them with wire clamps.
8. Lower the car onto its wheels.