Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's system that helps reduce pollution isn't working right because it can't measure air pressure correctly.
This code indicates a problem with the air injection system's ability to measure air pressure accurately, which affects emissions control.
The Secondary Air Injection System is responsible for injecting air into the exhaust stream to help reduce emissions. The air flow/pressure sensor monitors the pressure of the air being injected. If the sensor's initialization shows pressure out of the expected range, the system triggers this code.
• Check Engine Light is on
• Failed emissions test
• Poor engine performance
• Faulty air flow/pressure sensor
• Damaged or leaking air injection hoses
• Faulty secondary air injection pump
Secondary Air Injection System: A system that injects air into the exhaust to reduce emissions.
Air Flow/Pressure Sensor: A sensor that measures the pressure of air in the secondary air injection system.
• Use an OBD-II scanner to confirm the code.
• Inspect the air injection hoses for damage or leaks.
• Test the air flow/pressure sensor for proper operation.
• Replace the faulty air flow/pressure sensor.
• Repair or replace damaged air injection hoses.
• Replace the secondary air injection pump if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• BMW 3 Series
• Audi A4
• Volkswagen Passat
• Regularly inspect air injection hoses for wear.
• Ensure proper maintenance of the air injection pump.
• Use high-quality fuel to reduce emissions system stress.
Sensor Issue
• Address the issue promptly to avoid failed emissions tests.
• Consult a professional mechanic if unsure about repairs.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with vehicles that have a history of emissions system issues, particularly in models with aging components.
Moderate – This issue can lead to failed emissions tests and should be addressed to maintain vehicle compliance.
Driving with a malfunctioning emissions system may violate local emissions laws.
• Engine at operating temperature
• Vehicle in a stationary position
The air flow/pressure sensor is typically located near the secondary air injection pump or along the air injection hoses.
Q: Can I drive with a P145A code?
A: While the car may still drive, it's best to fix the issue to avoid emissions test failures and potential fines.
Q: What happens if I ignore this code?
A: Ignoring it can lead to increased emissions, potential damage to the catalytic converter, and failed emissions tests.
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Specialty · Smoke machine
Helpful for finding EVAP and vacuum leaks that are hard to see with visual inspection alone.
Helpful for tracking down EVAP and vacuum leaks that can trigger emissions faults.
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Specialty · O2 sensor socket
Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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Fitment Required · Vehicle-fitment part
Relevant for airflow, fuel-trim, and intake-metering faults after confirming the sensor is actually at fault.
Airflow and fuel-trim codes can involve the mass air flow sensor after proper diagnosis.
Verify the sensor design and fitment for your exact vehicle.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.