P0455 Volkswagen: What Is It & How to Fix It?

Fuel is the key part of any car engine, and issue related to fuel is always troublesome and often be fatal to the lifespan of the engine.

The P0455 Volkswagen error code hints at one of these fuel-related issues, and if you don’t act in time, your car’s engine will make a turn for the worse.  

But don’t worry, because, in this article, we will go through all the nitty-gritty details regarding P0455 Volkswagen and provide you with a guide to fix this issue.

So, let’s take a look at them, shall we?

P0455 Volkswagen

What does P0455 Volkswagen Mean?

The definition of the P0455 Volkswagen code is EVAP system large fuel leak detected. 

To simply put, if you face a P0455 Volkswagen, this means that there is a fuel leak or purge flow in the evaporative emission control system. If this happens, then the system will be out of fuel soon. This will also cause fuel overflow on other parts of the engine, which can result in critical accidents.  

What are the Symptoms of P0455 Volkswagen

The main problem with the P0455 Volkswagen is that you won’t be able to find many signs until something goes very wrong. That’s the same problem with the P0303 Volkswagen as well.These are some of the common symptoms of P0455 Volkswagen:

Check Engine Light is On

The first sign of any engine-related issue is the CEL continuously blinking or staying on as long as you use your car. If you see the CEL turned on, you can be sure of the fact that there is something wrong with your vehicle’s engine, and you need to change it. 

The smell of Fuel When You Drive Your Car

Now, if your CEL light is on and your notice fuel odors or smell fuel while you are driving or the engine is on, then it is a clear indicator that there is something wrong with the EVAP system that is connected to fuel.

If you are in this situation, immediately turn off your engine and take a look inside the hood. You shouldn’t risk a possible fuel leak while you are driving. 

These are the only signs that you can get if you are looking for P0455 Volkswagen symptoms. There isn’t much to begin with when this error code is concerned.

What are the Causes for P0455 Volkswagen?

Now, there are quite a few reasons why you might be getting the P0455 Volkswagen code. 

From simple reasons like an open valve to major issues like leaks can trigger the P0455 Volkswagen code. But most of the time, it is the latter. And that’s why if this code is found in the OBD scanner, your engine should be handled with care.

The causes of P0455 Volkswagen are:

Loose, Damaged, or Missing Fuel Cap

Damaged or missing fuel caps are arguably one of the main reasons for fuel leaking for most car engines that show the P0455 Volkswagen code. 

A fuel cap can be damaged over time. Or it can come loose if you haven’t properly installed it in the first place.

So, be sure to check the fuel cap first if the P0455 Volkswagen shows up.

Wrong Fuel Filler Cap

If you are using the wrong sized fuel filler cap, then you will eventually face a fuel leak. Some materials, like rubber filler caps, can often get burned or shrink in extreme weather conditions.

Faulty Fuel Filler Cap

Damaged or faulty filler caps can also lead to fuel leaks. If your fuel cap fails to close and remains open, then it is marked as a faulty cap. Also, if foreign objects or matters are stuck in your fuel filler cap, then it can also show the P0455 Volkswagen code.

Fuel Tank Leak

If your fuel tank is leaking, then you will definitely witness the P0455 Volkswagen code upon scanning. You will also smell the fuel if the tank is leaking or suffered damage of any sort. 

This is a very serious case, and you should take action as soon as possible. But first, if possible empty the fuel tank.

Faults in EVAP

Last but not least, the majority of P0455 Volkswagen cases are caused by issues surrounding the EVAP. If the EVAP canister is damaged or suffering a leak, then you will face the P0455 Volkswagen code.

On the other hand, if the system hose of the EVAP is leaking, you will also be witnessing fuel leaks. So, in general, any issues that connect with EVAP can be the reason for P0455 Volkswagen.

How to Fix It? 

How to Fix P0455 Volkswagen

To fix the P0455 Volkswagen issue, you will have to replace the parts that are causing the issue in the first place. The fixes that you might have to do are:

Step 1: Replace the gas or fuel cap

Step 2: If you are using the wrong sized filler caps then you will have to find and install the correct sized ones.

Step 3: Reinstall the fuel filler caps if they are damaged

Step 4: If something is stuck on the filler caps, then you will have to remove it. For some reason, if you can’t remove it, you will have to replace the filler cap itself

Step 5: Replace the EVAP system or replace only the faulty parts of the EVAP system. But that being said, if a part in the EVAP system is damaged, then it is highly likely that the other will face damage sooner or later.

How to diagnose P0455 Volkswagen

So, how can you be sure that your engine is suffering from P0455 Volkswagen? Well, you will have to diagnose the engine. There are a few ways you can do that. But it is best to follow a step-by-step diagnosis process.

The steps that you can take to diagnose are:

Step 1: Try Scanning

First, try to diagnose by using the OBD2 scanner. If there is any fuel-related problem in your engine, then it should show the P0455 Volkswagen code. This can also show up if your gas cap is a little loose. So look out for that too.

Step 2: Look Out for the Fuel Injector

Now, if you are still not sure which code your engine’s problem is related to, check the fuel injector. Make sure that the fuel injector is connected properly.

Step 3: Check the Fuel Filler Cap

Faulty, misplaced, or wrong sized fuel filler caps are often the reason behind P0455 Volkswagen. So, open your engine and check the fuel filler cap thoroughly. Has it come loose? Is it of the right size? Or is it damaged? 

During this process, also ensure that there isn’t anything stuck in the filler caps

Step 4: Examine the EVAP

Next, check the EVAP system. Go through all of the parts and see if there are any faults or damages. As the P0455 Volkswagen code mainly suggests that there’s a fuel leak in the EVAP, you should check it thoroughly to be sure.

Step 5: Check the Fuel Tank

If you are still not sure whether your car engine is suffering from P0455 Volkswagen’s symptoms, check the fuel tank. If it is damaged or there is some sort of leak then you can be sure that you are facing the P0455 Volkswagen code. 

You should be able to figure this out, as you will be able to smell the fuel odors as soon as you bring your nose around the fuel tank.

And there you have it. This is how you can diagnose P0455 Volkswagen for your car’s engine.

Is P0455 Volkswagen Code Serious?

Yes, this is a very serious issue as it directly connects with fuel. If you are ignorant and not careful, once your vehicle starts to point at the P0455 Volkswagen code, you might end up with a completely dead engine. The situation can get even worse, and you might have to see your car light on fire.

So, don’t take any chances, and go straight for repair if you have diagnosed your car’s engine and the result is P0455 Volkswagen.

What’s the cost to fix P0455 Volkswagen?

For most cases of P0455 Volkswagen, you have to take the engine to the mechanics shop unless you have expertise in that field yourself. You will have to work with a lot of sensitive parts. That’s why we recommend you get professional help for this one.

The overall cost of repairmen for the P0455 Volkswagen issue is around 2000 USD to 3000 USD. This includes the labor cost as well. 

For small repairs and replacements like replacing the gas/fuel cap or changing the filler caps, you can expect a cost of around 50 USD to 150 USD. The cost also heavily depends on your engine’s model. 


The P0455 Volkswagen code isn’t something that you can ignore, and you need to take action as soon as you face this code. 

Hopefully, if you have come this far in this article, then you know exactly what to do when you face this situation. 

So, use this article as a guide and take care of your car’s engine. Best of luck!

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