The bags might not deploy in the crash.

Mazda will recall 41,918 units of the 2009-2010 Mazda6 in the United States for a problem with the airbag control unit. These vehicles have manufacturing dates from February 4, 2008, to December 3, 2009.

The safety problem with these sedans is that they don’t have a sufficient protective coating on the airbag control unit’s power supply. This can make it easier for moisture to access the part and eventually cause corrosion. If there’s enough damage, then the system could turn off the airbags. This would be dangerous in a crash.

According to Mazda, drivers would see a warning light if this issue is occurring. There are no reports of accidents or injuries from the problem

Mazda first learned about this issue on January 28, 2016, when supplier Continental-Japan contacted the company. The headquarters told Mazda North American about the problem on February 2, and the division opened an investigation. After discussing the issue with the the National Highway Traffic Safety Administration, the government agency requested the business conduct a recall.

To rectify the problem, Mazda dealers will replace the airbag control unit. The company doesn’t currently have the parts though. The automaker plans to send a notification to owners about the problem and mail a second one when it has the components.

Mazda previously recalled 42,000 examples of the 2010-2012 Mazda6 for an incredibly weird problem where spiders built webs in the fuel tank's evaporative canister vent line. The smell of gasoline attracted the arachnids, and their homes in the pipe caused extra stress on the tank, which could have caused it to crack. This could have caused the vehicle to leak gasoline, which was a fire hazard.

The 2009-2011 Mazda6 is also part of a recently expanded recall to replace their Takata-supplied airbag inflators. Over time, the parts' ammonium nitrate propellant can degrade and cause the safety devices to rupture upon deployment. The flying shrapnel could cause serious harm to occupants.

Source: Mazda, The National Highway Traffic Safety Administration

Be part of something big