Three problems related to manifold/header/muffler/tail pipe have been reported for the 2007 Mazda CX-7. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Mazda CX-7 based on all problems reported for the 2007 CX-7.
My wife's 2007 cx7 was in a parking lot. My wife started it up, came to a stop sign and the car died without warning. It had 65,000 miles on it (5000 over the warranty) and wasn't even 3 years old. We had always gotten regular oil changes and had just had one the week before. We had it towed to the nearest Mazda dealer. The first time I talked to a service tech he mentioned the timing chain breaking. Later, they explained it as a valve (variable valve timing actuator?) failing and causing oil chain failure (jumping the gearing). My bill ($7500 - new engine) only states internal parts failure. They tried to indicate the oil was dirty even thought the oil was changed less than a week prior. After reading through many cx7 forums online it seems they were trying to build a case for engine sludge to cover themselves. Less than 2 months later replaced intake manifold shutter valve and had to flush and reseal brake lines. Went to kerry Mazda of ky to originally purchase a 2008 because of low finance deals. They shifted my attention to the 2007 (3500 miles) and I agreed because of the certified new (100,000 miles) program. When I found out I didn't have 100,000 mile coverage I went back to dealer and we pulled the paperwork and under the warranty it says certified and also remainder manufacturer's warranty. So it ends up they sold me a used car as new and I didn't even get the financing of a new car - very shady. Mazda corporate was of no help either, simply stating the car was out of warranty and there was nothing they could do. Needless to say I will never buy Mazda again. I will also make sure I don't trust what they say and make sure I read and understand every page even as they try and rush you through it. I fear someone will be killed when their cx7 suddenly stops on a busy highway. Hopefully, Mazda will address the problem before that happens.
7/6/10(25,000 miles) driving "piece of crap" from w-PA to phila after 1 1/2 hours in car airconditioning gets hot & loud noise starts. Able to pull off main highway &find a sears auto shop they say air compressor in my pice of crap (2007 cx7) has fallen apart - they don't do this work-I needed a Mazda dealership-they wouldn't recommend me driving home! it's a holiday (July 4th celebrated this day) I have no idea where a dealership is-I am over 200 miles from home - everything else is closed. Found a hotel to stay overnt & search for a dealership. Found 1 abt 20 miles away. Next day (praying the whole 20 miles) that piece of crap would make it to the shop. It did I explain situation to a non-caring, won't look me in the face mechanic who finally states (after 3 hour wait) my warranty expired 5 days prior & it would take 3 days to get part & fix. Here I am 200 miles away from home, in a not so racially diverse area of west PA- leaving for vaca the next day- & I can't get home!!! it was like pulling teeth to get a rental car # & a taxi cab # from these people. I was finally able to get home via 8 hour bus ride & go on much needed (after this ordeal) vaca, however I still had to pay over $800 & pick piece of crap back up. I complained to Mazda couple times &finally got letter that they were extending the warranty for air compressors to 60,000 so I got $ back, but not for the hotel stay, taxi ride to bus and bus ride home and back up there! couple other problems came up later -white smoke out of tail pipe after ideling, dealership couldn't find a problem, also saw something leaking, dealership couldn't find anything leaking--- 8/4/11 (31,000 miles) took piece of crap in for a noise it's making at start up. Vvt gone bad, but still under the powertrain warranty so got fixed. What's next??? I'm afraid to drive to far in this car!! can't take driving vacas-- gonna get rid of "piece of crap" prior to the warranties expiring in 2012! got to!!!.
I purchased a brand new 2007 Mazda Cx-7 in April 2007, the vehicle started experiencing engine problems in September 2007, I was told it may have something to do with the vvt (variable valve timing) and timing chain. The vvt was replaced by the dealership a short time later; however, not the timing chain. After the vvt was replaced my vehicle starting to experience thick white smoke coming out of the tail pipes. My dealership technician advised this was due to a turbo issue with the engine. All of this occurred within the first couple years of my ownership. I have had the turbo repaired (out of pocket expense), as well as the vvt (2 times) and the timing chain it all seems to no avial. The car is revving very high on cold start ups and is now experiencing a code as of the last couple of days that is stating there is a decarbonization issue with the engine that is linked to the timing chain. Of course this is now the 5th time this vehicle engine will be opened up to diagnose one of the known issues that Mazda north America is aware of. I have had this vehicle since 2007, and has just over 120,000 miles on it. I have maintained a very good service history on the vehicle taking it to "reliable" Mazda dealerships in the area where I live. My main concern is Mazda is doing nothing to rectify the issue and it's only a matter of time before someone is seriously hurt or even worse. The vehicle safety is impaired due to unstable engine performance. There is obvious technical issues with the engines for this Mazda engine model.