Lambda probe

Hello good I have a 2000 Renault Laguna.I 8Vde 1995 and I have black spark plugs like carbon but without oil the car goes to three cylinders little strength can be due to the broken catalyst or the lambda probe. The car has 200,000km does not burn oil.

Hello, it perishes that you have a problem with an excess of fuel either carburation or injectors, because how is the air filter

Hello, how were
you already looking at the spark plug calibration if your calibration is very serrated, they may not be delivering the spark as you need
if you doubt if it is your Lambda probe the only thing you have to do is disconnect the monitoring harness that goes to the computer after that you put it to work as 2 hours and check what power gives you if the problem is correct only