Mazda 3 P0507: Idle Air Control – RPM Higher than Expected

P0507 This is an OBDII common trouble code. This code is usually triggered when engine idle speed exceeds 200 rpm. This code is generic, meaning it can be used for any engine. Mazda 3 Like any other vehicle.

P0507 Symptoms

You will notice P0507 while driving, unlike many OBDII codes. The 3 symptoms are:

• Coming Soon: Service Engine Light– The reason why you are here.
• You can use your Idle speed faster– Assuming that the code has been thrown due to a legitimate issue, you should notice the engine running faster when not pushing the gas.
• Thud Going Into Drive– Transmissions really don’t like to shift from park to drive at an RPM higher than idle. You may feel your whole car shake when you shift into P0507.
• Vehicles take off quicker– With the engine idling higher, people report feeling the vehicle take off when releasing the brake pedal. Driving can become more hazardous.

Mazda 3 P0507 Diagnoses and Causes

Many possible causes of P0507 exist. While the code specifically mentions the “Idle Air Control System”, it would be a mistake to just go ahead and replace it without a little due diligence. However, it is sometimes not the reason for the code.

Below are some common problems with the Mazda 3's P0507, as well as how to fix them. Be aware that different model years can cause P0507 symptoms. Start by searching for the a Vacuum leak You can then move on from there.

Vacuum Leak

Leaking vacuum systems can cause the engine to run more slowly. The vacuum system can leak, allowing more air to get into the combustion chamber. This allows for slightly higher combustion rates, increases RPM, and throws code.

How to find a vehicle Vaccum Leak (Popular Mechanics, Article)
Find a Vacuum leak in under a minute (2CarPros, YouTube)

Bad things can cause a vacuum leak vacuum hoseThe Take in a lot, EGR SystemYou can find it anywhere that air is flowing. It’s not hard to find a vacuum leak though. Use the resources above and you’ll find it in no time.

Valve for Idle Air Control

Modern fuel-injected engines come standard with an electronic ignition system. idle air control valve. However, not all are. If you have determined that you don’t have a vacuum leak, the IAC is a great second place to troubleshoot P0507.

How to Diagnose an IAC Valves (Autozone Guides)

Throttle body

In the course of an automobile's life, the throttle body will open and close millions of time. It can collect dust from all the air passing through it. It can alter the characteristics of your vehicle's idle. When dirty, you’ll often feel the vehicle almost stall before the computer compensates and opens it a little more.

If the throttle body is damaged or not properly controlling airflow, then the code can be thrown.

How to spot signs that your throttle body is going down (Repair Pal)
What to do if your throttle body is dirty or bad? (YouTube Auto Repair Youtube).

Conclusion

The P0507 problem is serious. Due to the unsafe nature of driving with an engine that is revving higher than it’s supposed to, we recommend having your 3 serviced as soon as possible. We wish you all the best!