My 55 plate auto 160k 630i runs great, it always has. Twice now the engine management light has come on and it has reported a fault with the cats. It was cleared once, then it came on again about three weeks later. The Garage can't see any physical problem with the cats, and the sensors are not reporting as faulty. Is there any way to stop it monitoring the cats? I am sure on old jap imports people used to take the cats out an disable the sensors.
29F4 / 5 - Catalytic converter conversion errors which I believe imply the cats aren't working as well as expected.
It uses a fair bit of oil but never smokes so he is wondering if the cats have been filtering the oil out so are knackered. I'm guessing replacing them would be very expensive.
Garage suggested seeing if anyone can turn the sensors off with s/w. He can't as his official BMW software won't let him. He also said they can be a bit over sensitive and one option is to ignore it if the car is running fine!
Does cat cleaner actually do anything? I put a bottle through the first time the light came on.
Other than do that, does anyone have any tips / hints / ideas on what can be done other than examine / possibly replace the cats?
If the cats are shot, is it likely to fail an MOT on emissions?
Any thoughts / advice greatly appreciated.