Question about Ford F-150
The 405 is EGR Valve related ,so work on that first
The 175 is a Rich O2 Sensor on Bank 2
The would be the drivers side for you
I would replace the front 2 O2 Sensors IF
they have more than 100,000 miles on them
That is when they should be changed
Once the egr works the O2 code will go
away,maybe,unless your about to have the
famous ignition coil experience we all have with
fords once or twice a year.
Posted on May 26, 2011
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Posted on Jan 02, 2017
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