Here are Mazda CX-7 engine problems, by model year. The most common CX-7 engine problems cost $3,500 to fix & occur at 91,000 miles. Regarding the worst model year 2007 Mazda CX-7 engine problems, "The 2007 Mazda CX-7 has numerous reports filed with the NHTSA about engine & A/C problems." Click on a year below.

Worst Engine Problems
engine timing chain stretched 2007 Mazda CX-7
turbo went out 2007 Mazda CX-7
engine failure 2008 Mazda CX-7