July 12, 2019—Mazda issued a recall for approximately 262,000 cars and SUVs and the cars' cylinder deactivation tech is at the root of the issue, reported CNET.
When transitioning from cylinder deactivation to full cylinder activation, a powertrain control module in charge of the hydraulic valve clearance adjuster might function incorrectly. If that happens, the intake valve rocker arm might leave its usual position and bump into other engine components.
If this happens, the engine may misfire or lose power, and a warning light might illuminate on the dashboard. The engine also has a chance of stalling without the ability to restart. Any of this can increase the risk of a crash while the vehicle is traveling at speed.
Mazda said it received no reports of accidents or injuries stemming from the problem.
