Question about 2006 Mazda 6 s

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Engine roaring above 30mph

Rear section of exhaust replaced also recently passed mot so assume cat ok. noise usually disappears while steering on a bend and returns on the straight

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Is it possible you are hearing a wheel bearing instead of the engine or exhaust ?
Normally a bearing will roar on a turn and not on a straight stretch, but I guess its possible to do it the other way. A tire will make a roaring noise too.
I can't think of anything related to the engine that would roar only on a turn except maybe the power steering.

Posted on Feb 19, 2013

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Posted on Jan 02, 2017

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E46 TUning

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SOURCE: RX8 Melting Cat , Missfire

My car is currently at the dealership with the same issue I think it is the front oxygen sensor not working which caused a lot of heat and the car would not drive more then 2 miles without over heating. I am awaiting diagnostics from Mazda but may get a cat replacement pipe installed with a new sensor.

Posted on Mar 24, 2011

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P29096 and p0133 code Not passing smog. Originally had two codes Inc o2 and inc cat and no engine light On so did not pass. Moved some 02 sensors and engine light suddenly appears now. Now I get p2096 and...


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

Jun 14, 2018 | Cars & Trucks

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Engine is loud when driving and causing a vibration on passenger side


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

Dec 17, 2016 | Cars & Trucks

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Replaced my cat on neon ...still makes loud sound from that area in cabin. Mechanic feels it was a the cheap after market unit I purchased. Motor mounts were replaced but this sound is like a loud .


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

Nov 09, 2015 | Cars & Trucks

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Hi i have range rover 2003 diesel vouge problem is recently i have changed my exhaust because some noise was coming .machanic he removed the filter from the exhaust .noise has been stopped but today i...


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.

Mar 26, 2015 | 2003 Land Rover Range Rover

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Noise either from the engine or transmission


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

Jan 20, 2014 | 1998 Jeep Grand Cherokee

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My 95 maxima wants to stalls when when I accelerate pass 30 mph, it makes a loud roaring sound like it has a vacuum leak or something.


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 ?

Aug 25, 2012 | 1995 Nissan Maxima

1 Answer

I have a 05 altima which has its service engine light on and the code when tested was a p0420. When I asked two different mechanics what to do with this they gave me different answers. One was sure my cat...


Sigh.If you DONT know what it is, you really should take it to someone who does and TRUST THEM. if you dont know who to trust, then you really need to ask around and find someone.
NOW, P0420 on a 2005 is USUALLY always the cat. However other things can make a cat set the code when it still may have lyfe left.
O2 sensors need to be in GOOD condition (not just barely passing OBD2 test).

Zero, none, no, absolutely NO EXHAUST LEAKS! Any exhaust leak between the engine and the catalytic converter can cause a good converter to fail its testing because the excess Oxygen from the leak currupts the lightoff. And Exhaust leaks near an Oxygen sensor can cause the computer to make mistaken adjustments to fuel mixture, which creates a rich or lean exhaust, which then causes cat not to work. I repeat for the cheap seats: NO EXHAUST LEAKS!!

Now, yours is a 2005, so check for factory service bulletins (dealer or autozone) regarding cat defects or recalls. If you dont find any, AND the above proves out, AND there isnt any red herrings...you probably need a cat. After 2002, the computer in that car is pretty smart...it knows to test its O2 sensor, its warmup tyme, and it compensates for alot of subtle variables. If there are no OTHER codes but the 420, the computer probably is right and you should trust it (post 2000 anyway and assuming still the exhaust leak thing is tested OK)

An expert could test this for you BTW and youd know for sure. Guessing is bad and costs money sometymes that is excessive and un-needed. You dont rewire your TV or DVD players innards when they dont work, and they cost a couple of hundred. Now you wanna fix something that sold new for 10-50k or more, with over 3000 moving parts, that is safety related, heats to over 400 degrees surface and 250 water, was designed by no less than 35 engineers with degrees...using a post on the web from people you dont know?

hey, more power to ya. Just be ready for the web solutions to sometymes be wrong or confuse even more.

Aug 24, 2011 | 2005 Nissan Altima

1 Answer

In park with engine running everything sounds fine and smooth as can be. all fluid levels are good. when i put it in gear it sounds and feels fine. when i start rolling i hear a roar. it doesn't drive...


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

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2 Answers

My engine exhaust warning light is on, amber, in my 2000 VW Beetle it was MOT-ed just last month and passed is it just a sensor issue or is it more serious?


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

May 12, 2010 | 2000 Volkswagen Beetle

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