C0121 Subaru Forester 3 DTC Code

Subaru Forester 3 Engine Specifications:

Engine Type :	Multi-Cylinder Engine
Cylinder Type :	W-Type Engine
Engine Air Intake Process :	Supercharged Engine

Your Subaru Forester 3 engine control system detects a problem, the computer stores the diagnostic trouble code C0121 in its memory. To figure out what is wrong with your vehicle you must first extract the C0121 DTC For Subaru Forester 3.

Another consequence of C0121 Subaru Forester 3 engine overheating may be a blown head gasket. Heat makes aluminum swell almost three times faster than cast iron. Thermal stress can distort the head and make it swell in areas that are hottest like those between exhaust valves in adjoining cylinders, and areas that have restricted coolant flow like the narrow area that separates the cylinders. The typical aluminum head swells most in the middle, which can crush the head gasket if the head gets too hot. This will usually cause the head gasket to leak compression between adjacent cylinders, or leak coolant into the cylinders.

C0121 Subaru Forester 3 DTC Meaning

C	Chassis Code - Problem is controller area network wiring bus and modules.
0	SAE - Generic
1	Fuel And Air Metering
2	Cruise Control Servo Indicates Low
1	PCM Stack Overrun

There are currently two main types of cylinder deactivation used today, depending on the type of engine. C0121 Subaru Forester 3 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.