P2433 Code: Secondary Air Injection System Air Flow/Pressure Sensor Circuit High Bank 1

During cold engine start-up, the secondary air injection system (AIR) pumps fresh air into the exhaust system. This aids in the combustion of the highly rich exhaust emissions that the engine produces as it warms up. The engine computer monitors the AIR system’s functionality using an AIR pressure sensor. P2433 is a generic trouble code that’s related to the pressure sensor circuit.

What Does the P2433 Code Mean?

Diagnostic trouble code P2433 stands for “Secondary Air Injection System Air Flow/Pressure Sensor Circuit High Bank 1.”

The powertrain control module (PCM) sets the code when it detects a voltage or resistance that’s too high from the air pressure sensor circuit located in Bank 1.

The secondary air injection system reduces hydrocarbon exhaust emissions during engine start-up when the weather is cold. The power control module (PCM) activates the air pump, which supplies pressurized fresh air to the catalyst or exhaust manifolds. This accelerates the converter’s operation and lowers the level of harmful exhaust gas.

The air system pressure sensor monitors pressure at the air control solenoid valve inlet to open and close the valve at predetermined temperatures and pressures based on manufacturer recommendations.

Note: The definition of code P2433 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P2433 Code?

• Bad secondary air system pressure sensor
• Air control solenoid malfunction
• PCM problems
• Wiring issues

What are the Common Symptoms of the P2433 Code?

• Noise from the secondary air injection system
• Illuminated check engine light

How to Diagnose the P2433 Code

DTC P2433 is a generic trouble code, so various makes and models can log it. However, this doesn’t mean that there’s a universal diagnostic procedure and solution for it.

You can always choose to bring your car to a qualified mechanic to get a precise diagnosis. But if you’re confident you have the tools and know-how to diagnose the problem, you can do it yourself.

Here’s a video of what the diagnostic procedure for this code might involve:

How to Fix the P2433 Code

The process to resolve a P2433 code can vary depending on the year, make, and model of the car. So if you want to address the issue on your own,  make sure to gather vehicle-specific repair information before proceeding. You might want to check out repair guides like those from Chilton or an ALLDATA subscription.

But if you don’t have the tools, knowledge, or DIY experience needed for the job, you can always take your vehicle to an auto repair shop. Licensed mechanics will know how to resolve this trouble code.