A P0174 lean code for bank 2 is the
cylinder bank on the LEFT (driver) side of the engine on
Ford vehicles with a
transverse-mounted V6 engine and front-
wheel drive. This
code is not set on
four cylinder engines
(no bank 2).
WHAT A LEAN CODE MEANS
A lean fuel condition may exist if the
engine is sucking in too much air and/or the fuel system is not
delivering enough fuel. If bad enough, a lean fuel condition may cause
lean misfire, a rough idle, hesitation or stumble when accelerating,
and/or poor
engine performance
.
Unmetered air can enter the engine
through a vacuum leak, a dirty airflow sensor that is not reading
airflow accurately, an EGR valve is not closing and is leaking exhaust
into the intake manifold, an EGR valve that is allowing too much flow
(because the EGR differential pressure sensor that monitors EGR flow is
faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the
underling cause may be a weak fuel pump, restricted fuel filter, leaky
fuel pressure regulator or dirty fuel injectors.
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