Engine roaring above 30mph

During acceleration or deceleration the engine moves on rubber mountings and a defect in the exhaust or intake pipework could open so either exhaust or intake roar would become louder - of course it might be something else...

code p 0133 is the heated oxygen sensor (HO2S)1 bank 1 so response --no response or--no signal=== causes wiring--heating inoperative---HO2S -- o2 sensor ( oxygen sensor
the HO2S is in the exhaust manifold before the cat converter and the O2 sensor is after the cat converter
the code p 2096also refers to the HO2S --wiring short to positive --cat converter--exhaust leak ( possible the flex section in the exhaust pipe before the cat converter

Wheel may need balancing, small quick job at garage. As for loud engine noise and vibration......miss firing cylinder, engines mount loose but more like something to do with exhaust manifolds leaking.
If you do one wheel, do them all...balance that is.
Good to check all parts of the steering bushes etc for loose rods.
One more simple check is to look for holes in engine heat shields and sound proofing. ............and check all wheel nuts are tight !
It happened to me, back from brake pad change, drove car home and the vibration really got my attention....I checked everything, except wheel nuts. I couldn't believe it could happen... but the *%$£" mechanic hadn't done up the nuts proper......small things can cause big trouble. Good luck

probably not the cat at all but a cracked flexible section in the exhaust pipe before the cat or a crack at the flange at the exhaust manifold
cats work regardless of the price and do not make noise either if fitted correctly
Pass on the mechanic and go to an accredited muffler/ exhaust fitting shop and get a diagnosis and a quote

I assume we are talking about a UK spec vehicle? If so, without the filter even a car in great working order is likely to fail its MOT smoke test. From the sound of it yours hasn't a hope of passing. Also, and you need to check this, I think you will find that removing the filter is illegal. One way or another it needs to be replaced.



Next you need to ask yourself why removing the filter solved the problem. Have you understood cause and effect correctly? My first guess would be that the smokey exhaust from your engine had blocked the filter. I would suggest you fix the engine smoke first and then replace the filter with a new one. These BMW engines can reach very high mileages without problem if they are well maintained so the fix could be just a question of a quick tweak. On the other hand it could be very, very expensive.



Unless you are fortunate enough to have the space, money, time and know how to restore it to its former glory as a pampered classic or you intend to cut it up to make a trials off roader I would sell it. If you don't it will become a money pit. Do I take my own advice? Yes I sold my perfectly reliable 2003 model last year as all the well known brake, transmission and electronic problems were all beginning to appear. Normally it is the engine that is the good bit. Good luck.

check for a loose heat sheild on exhaust system usually on top of catalytic converter....happened to me

You may be hearing the air intake - could be a leak in the intake hose to the air filter.
Is the check engine light on ?

You might have the front wheel bearings checked out. First drive it on some curves and bear left and then bear right see which way quiets it down. That really only works if it is in the front, however the rear ones do go bad as well, however it is usually the front ones that go with a roar. Hope this helps

the cat has the ability to reduce the co2 levels ,so it needs the cat to pass the mot

have the car put on a diagnostic machine,it will tell you straight away.(souds like cat converter or lamda probe.....)