Litt info på engelsk
There is one problem that can cause a large airflow disparity, and that is if one catalytic converter has failed and has blocked the flow of exhaust gasses. In this situation, one cylinder bank runs rich, and the other bank runs lean. Depending on how restricted one exhaust is, the air/fuel ratio can be a long way from ideal. Catalytic converters can both melt and restrict gas flow, or (more often), disintegrate and block the exhaust system at the resonator or back boxes. Fortunately, there is a simple test for a blocked exhaust and that is to remove the pre-cat Lambda sensors and measure the exhaust pressure while the car is running, the blocked side will have a much greater back-pressure.
Fins universal katalysator å få kjøpt,men disse bør sveises på,funker dårlig med klemmer og skjøter pga varmen.