Q: P0411 and error code,can't locate diverter valves to check them. on 1997 Mercury Sable

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Also P0420 code
(1) Answer
p0411 is for secondary air pump. air pump located between radiator and transmission. diverter valve located under intake tube between air filter and throttle body. p0420 is for catalytic converter bank 1 which is the rear converter.
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