Was trying to replace the air filter. It turns out there is a second air filter attached to the top of the housing, in PZEV engine vehicles. It’s not meant to be replaced. A friend thought it wasn’t supposed to be there. It got pulled out, and was torn in the process. I can’t even figure out how t…

That second filter contains activated charcoal. Its purpose is to capture any fuel vapors left in the intake manifold and cylinders (with an intake valve open) when the engine stops. Unburned or partly burned fuel is a pollutant. By the same token, gas tank fumes are captured by the EVAP system, …

2013 Hyundai Elantra PZEV Upper (2nd) Air Filter

Maintenance/Repairs

Cavell December 10, 2020, 4:49pm 3

I have seen a Ford Focus with a lifetime filter. It has a green/red gauge on housing. If it is red, it has met end of life. Time to junk car? Or replace filter housing?

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2013 Hyundai Elantra PZEV Upper (2nd) Air Filter

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