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

Also P0420 code

by in Allentown, PA on July 25, 2013
1 answer
ANSWER by on July 26, 2013
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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