P243A Secondary Air Injection System Air Flow Pressure Sensor Range Performance Problem

• OBD2 Code: P243A
• Description: Secondary Air Injection System Air Flow/Pressure Sensor Range/Performance
• Definition: This code indicates that the air flow or pressure sensor in the secondary air injection system is not operating within its expected range, which may affect the vehicle’s emissions control system.

p243a – Secondary Air Injection System Air Flow/Pressure Sensor Range/Performance Problem

Typical Severity: Moderate

Common Causes

p243a – Secondary Air Injection System Air Flow Pressure Sensor Range/Performance Problem

Common causes of the OBD2 code p243a include:

• Faulty air flow pressure sensor
• Blocked or restricted air injection system components
• Vacuum leaks in the air injection system
• Wiring issues such as shorts or open circuits
• PCM (Powertrain Control Module) software needs to be updated

 

Common Misdiagnosis

OBD2 Code: P243A

Description: Secondary Air Injection System Air Flow/Pressure Sensor Range/Performance Problem

Common Misdiagnosis: Replacing the air flow pressure sensor without checking for clogged or damaged secondary air injection system components such as hoses, valves, or the pump itself.

 

Common Diagnostic Steps

OBD2 Code: P243A

Description: Secondary Air Injection System Air Flow/Pressure Sensor Range/Performance Problem

• Check for any additional codes that may indicate a related issue.
• Inspect the secondary air injection system components, including hoses and valves, for damage or leaks.
• Test the air flow/pressure sensor using a multimeter to ensure it is within the manufacturer’s specifications.
• Verify that the electrical connections to the sensor are secure and free from corrosion.
• Examine the secondary air pump operation to confirm it is functioning correctly.
• Use a scan tool to monitor live data and check if the sensor readings are consistent with expected values during operation.
• If necessary, replace faulty components such as the air flow/pressure sensor or secondary air pump.