A lack of power may develop due to a failed turbocharger. Failed turbochargers will require replacement to restore engine power.
Car Problem Reports
Mazda CX-7 Turbocharger May Fail
Mazda CX-7 Problem
Average Mileage: 65,841 mi (40,000 mi - 90,000 mi)
Visitor, 2007 Mazda CX-7, 60,234 mi
This is the second turbocharger that has failed in my 2007 CX 7. The dealership was quick to write off the initial failure due to inadequet maintenence, ie..."engine sludge." White smoke would pour from the tailpipes so I contacted my local Mazda dealer. They couldn't duplicate the problem and told me there was engine sludge build-up from improper oil changes, which I informed them was BS. I had them change the oil to full synthetic, at a cost of around $100 only to have the same problem within days of leaving the dealership. I contacted them again and they informed me to bring it back. Apparently, a different Mazda tech worked on the car from only a few weeks earlier. Guess what? His diagnosis was that "it is evident that the oil hadn't been changed in a long time, therefore the issue was once again improper maintenence." Needless to say the service rep didn't know what to say because we just had the oil changed, by them, only 3 weeks earlier. However, once again, they couldn't produce the "white smoke" I brought it in for. This time they changed the oil, without my knowledge, yet submitted a bill to me upon my arrival. I refused to pay it and told them to drain the new oil out and put the old, 3 week oil, back in. Obviously they couldn't do that and they waived the charge. Third times a charm, and within day......"white smoke!" When I took it back to them this time I didn't leave until the mysterious white smoke appeared. Finally, they admitted there was an issue with oil leakage into the turbo and they repaired it under warranty. 22,000 miles and 24 months later I got in the car to take my daughter to school only to have the car not accelerate, with a loud whinning noise. I knew immediately what the issue was! After doing a little online research there is no doubt this "new"...."second" turbocharger went bad! I have left 2 messages now for the Mazda service rep to call me back and I'm still waiting! I'm almost certain they will tell me again the problem is from my negligence due to engine sludge build-up! How can Mazda get away with this when the problem is so prevelent nationwide? I will update this post after I speak with them again.
Visitor, 2007 Mazda CX-7, 89,800 mi
Just bought this used, certified. No issues showed up on the CarFax so I felt I could drive this for at least another 3-4 yrs. BAD decision. Turbo went out less than 2 months after purchase. Was driving when car seemed sluggish and having problems accelerating. Was just getting ready to pull into a parking lot to check out things when I noticed a huge trail of smoke coming front my exhaust. It was so bad that people were pulling over to help me, thinking the car was on fire. That was enough to scare the crap out of me and get out of this car. After doing more in-depth research on this year and model, I am appalled at all the other stories of the same thing happening...and that Mazda has not stepped up. I will take a loss on this but it's better than dealing with a completely unreliable, unsafe Lemon like the 2007 CX7. I've had 2 Mazda's in the past which is why I went with the CX 7...never ever again Mazda.
Visitor, 2008 Mazda CX-7, 70,100 mi
detailed description of your problem: turbocharger failed
the diagnosis : impeller came apart, mazda refused to cover any of the repair
how it will be fixed: last mazda i will ever buy or recommend
Visitor, 2008 Mazda CX-7, 71,000 mi
Last week the turbocharger started making a high pitched whine when accelerating. I took it to Mazda today and they told me it needed to be replaced. Vehicle has been correctly maintained.
Visitor, 2007 Mazda CX-7, 79,000 mi
I bought the car in Florida in 2011 and was told there was only one owner, and it was in good condition. Upon my "white smoke" problem that recently occurred, I was told by my local Mazda dealer that the first turbocharger went out in 2009 (according to reports). And that this one last four years, so that's "pretty good". WHAT?!?! This is obviously a problem with MAZDA cars, yet no recall was ever issued. This is obviously an issue that Mazda needs to address. Now the dealership is telling me it's okay to drive and the turbocharger will burn out, and make a loud whining noise... I don't feel comfortable with losing VALUE on my car.
Visitor, 2009 Mazda CX-7, 49,500 mi
I'm having the EXACT same problem. I was on a trip, 300 miles from home, when the "loud whining sound" started, and the engine lost power. I had significant clouds of smoke coming from the tailpipes intermittently also.
Had to have it towed to the dealership, and their first response was "sludge in the engine, improper oil changes." I had just had my oil changed 3 weeks previously! So now I am waiting to find out if my extended warranty is going to cover the service or not, based on "improper oil changes."
This sounds like I am only just copying the recent post, but this is all quite true! Mazda needs to take ownership of this and take action!
Visitor, 2007 Mazda CX-7, 70,120 mi
I have the same issue. Mazda was very quick to say "Sludge". I had the vehicle at the dealer in December 2012, well under warranty, for repairing the timing change and cleaning the turbo tube. At that time, the dealer knew there was a problem with the turbo but didn't fix it. Now they say that the warranty is out and they want to charge me 150 to look to see if there is "Sludge" which we know they will find since this is their response for everything. Also, when I had the cx-7 in for a repair of the nav screen they failed to put the cd player back together properly. This is my 4th Mazda and also MY LAST!!!
Visitor, 2008 Mazda CX-7, 40,000 mi
Visitor, 2008 Mazda CX-7, 40,180 mi
Turbocharger failed, replaced.
Visitor, 2009 Mazda CX-7, 80,000 mi
Noticed a lack of acceleration. Inspection revealed "failed turbocharger". Was told it needed replacing(up to $2400). Stay tuned...