On some models, excessive engine vibration or knocking noises heard while the engine is idling, being started or switched off are usually caused by a defective engine mount at the top right side of the engine. A redesigned engine mount is available to alleviate this problem.Google+
Car Problem Reports
Mazda Mazda5 Defective Engine Mount May Cause Excessive Vibration/Noise
Mazda Mazda5 Problem
Average Mileage: 81,312 mi (40,000 mi - 125,000 mi)
Visitor, 2006 Mazda Mazda5
Dang, again, just seeing this site for the first time... but, it seems like my Mazda 5 is having all the same issues. Had to have my motor mounts replaced.
Visitor, 2006 Mazda Mazda5, 91,000 mi
Our 2006 Mazda 5 normally runs very quietly but suddenly began making loud engine buzzing/vibration noises when at idle or low speeds. Higher speeds resulted in less noise but the noise/vibration was still there. I first suspected an exhaust leak but within a day or two the noise/vibration grew to be too much to be just an exhaust leak. I took it into a shop I trust and was told a motor mount was broken. The shop recommended I replace all three mounts at once at a cost of $840 (including labor and their "diagnostic" work).
My wife's 2004 Mazda 6 (also with the same 2.3l 4-cyl engine as my 2006 Mazda 5) began exhibiting the same noise, (though much less noisy) the week prior.
Visitor, 2007 Mazda Mazda5, 40,000 mi
When I took my 2007 Mazda 5 in for another problem, they told me my engine mount had been replaced under warrentee. Car was quieter and handeled better after that.
Visitor, 2010 Mazda Mazda5, 83,001 mi
Was told the Upper Right Motor Mount needs to be replaced due to leakage
Visitor, 2009 Mazda Mazda5, 94,000 mi
Vibration when stopped in gear.
Visitor, 2006 Mazda Mazda5, 90,000 mi
replaced upper passenger side engine mount myself with aftermarket of same crappy quality.
Need to replace again. it's shot. Need to find if there is a redesigned one that wont fail.
Visitor, 2010 Mazda Mazda5, 46,800 mi
I just got my 2010 mazda 3 a year and a half ago when it was at 39k miles, just took it in for it's 15k checkup and things looked good, usual stuff except being told a motor mount was leaking and needed to be replaced. Estimated about $249 for that part of the work. Not too bad... at least at the dealership I know that it's being done right and the work is warrantied.
Visitor, 2009 Mazda Mazda5, 49,000 mi
I have fluid leaking from the engine mount of my 2009 Mazda5. I have never seen an engine mount leak fluid. This sucks royally!
Visitor, 2006 Mazda Mazda5, 125,000 mi
I replaced engine mounts May 2011. I just had the car oil change and inspection. They said the engine mounts need replacing again and warranty is only a eighteen months on previous part. I was out of luck at 20 months.
Visitor, 2007 Mazda Mazda5, 116,000 mi
On third set of motor mounts...