![]() Most of the time it’s a vacuum leak or the idle air control valve. Good luck diagnosing P0505 in your Zafira. Cleaning it around the throttle blades will solve the problem in this case (most of the time). This happens because the engine can’t adjust to this problem fast enough. Often, when this is the case, you’ll feel the engine stall for a second before it recovers when slowing down. If the throttle body gets dirty enough, it can change the amount of air able to get into the engine. Inspecting the area around the IAC for passages blocked with carbon can often fix the problem. The IAC inlet area can get carbon buildup on it. Here’s a great article from Popular Mechanics on how to find a vacuum leak. Intake manifold leaks, and leaks around the throttle body can also code your Zafira to throw this code. If they look cracked or dry rotted it may be time to replace. While the idle air control valve is often the cause of P0505, it’s a great idea to start diagnosing it by looking for a vacuum leak. If you determine that you need a new idle air control valve, they are relatively affordable. Here’s a great YouTube video on how to clean a idle air control valve. You may need a new one, or you may be able to get away with cleaning it. The IAC valve can get either dirty or stuck. It does this by letting in just the right amount of air to get the idle speed where it needs to be. The idle air control valve’s primary job is to regulate the idle speed of your engine. While replacing the idle air control valve seems like a good idea, it’s worth your time to check for a vacuum leak first. Typically, P0505 is going to be caused by either a vacuum leak, or a problem with the idle air control valve. Here are some of the most common symptoms of P0505: This particular trouble code lets you know that there is something wrong with the idle air control system, but that’s about it. When P0505 is triggered, it is typically caused by a stuck idle air control valve, a clogged idle air control valve, or a vacuum leak. P0505: Idle Air Control System: Malfunction It’s a generic code, which means that it has the same meaning for the Zafira as it would any other vehicle (Zafira or not). P0505 is an OBDII code that deals with the idle air control system in the Opel Zafira. ![]()
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