P03A3 Subaru K111 OBD Code

OBD/2 P03A3 error code description and symptoms.

The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code P03A3

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

P03A3 Subaru K111 Error Code Repair Process :

The rule of P03A3 code when it comes to emissions-related vehicle repair is that any modification that changes the vehicle from a certified configuration to a non-certified configuration is considered tampering: this applies to both vehicle owners and repair facilities and is, therefore, a Federal offense. Replacing a catalyst with a straight pipe is one traditional example of lack of ho2s switch - sensor indicates lean. Likewise, overriding the OBD P03A3 error in system through the use of high-tech defeat devices or non-certified computer chips, for example, would also be considered tampering. The OBD system may, however, be repaired back to its original certified configuration with certified performance chips or appropriate aftermarket parts.

Common Causes of Subaru K111 P03A3 OBD2 Code

A common cause of code P03A3 is the failure of Lack Of HO2S Switch - Sensor Indicates Lean, but there are several other possible causes as well, such as ;

Continuous oil flow to the VCT piston chamber
Faulty spark plug (s)
Faulty spark plug (s)
Clogged or faulty fuel injector (s)

P03A3 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

About Us | Contact | Privacy

P03A3 Subaru K111 OBD Code

P03A3 Subaru K111 Error Code Repair Process :

Common Causes of Subaru K111 P03A3 OBD2 Code

P03A3 code for other Subaru cars