You’ve most likely already been aware of the renowned EGR valve, the anti-pollution valve. It is not always appreciated by car owners because it is likely to cause more problems than anything else… Actually, based on the use you are going to make of your automobile, it can become congested and trigger you a lot of problems. If this is the case, you are most likely concerned about how to clean the EGR valve of your Mazda CX 5 ? Don’t stress, we’ve made this article to help you with this procedure. To achieve this, we will first check out the role of the EGR valve, then what are the failures that the EGR valve of your Mazda CX 5 can trigger and finally the section that will most likely appeal you the most, how to clean the EGR valve Mazda CX 5?


How to Clean your Mazda CX 5 EGR Valve: Role and Operation

Goal of the EGR valve

The EGR valve of your car has been added to diesel engines principally to lower pollution emitted by cars and to meet EURO measures on Mazda CX 5 . It will therefore influence the quality of exhaust gas output and eradicate toxic particles, mainly Nitrogen Oxide.

Operation of the EGR valve

Before we discover how to clean the EGR valve on your Mazda CX 5 , we will take a look at how it works. As described before, its objective is to clean the exhaust gases, so it will be installed at the engine outlet, thanks to a valve, it will be able to return the unburned exhaust gases to the engine for a second burn which will eradicate all unburned toxic particles. It will work mostly at low speed because at high speed the combustion is sufficient to burn all these gases.

How to clean your Mazda CX 5 EGR valve: Identifying faults

The EGR valve, nevertheless very useful to limit the pollution emissions of your Mazda CX 5 , will unfortunately tend to clog up because of soot/gas deposits that will accumulate in its system, which will ultimately risk blocking the functions of the valve, until completely blocking the engine unit, here are the signs of illness that a defective EGR valve on your Mazda CX 5 can bring about:

  • Motor light on
  • Performance loss
  • Technical inspection rejected
  • Black gases
  • Vehicle that grazes at low speed
  • Low RPM settings

How to clean your Mazda CX 5 EGR valve: In practice

And now we’ll begin the section you are most interested in, how to clean the EGR valve of your car. Here are the two techniques that you can use.

Do it on your own

How to clean your Mazda CX 5 EGR valve system: Without taking it apart

Although this procedure is less efficient, it is however possible to consider a “rough” cleaning of your EGR valve, in reality, you will only need to use fuel additives, equivalent to the products used to clean the injection. These specific solutions must be injected into the running engine, at the right operating temperature, diluted in about 20 litres of fuel and run the engine for 3 or 4 minutes in high rev to clean the EGR valve of your Mazda CX 5.

How to clean your car EGR valve: With disassembly

Here is the strongest procedure, which will require sufficient access to the EGR valve to execute the operation yourself. If so, the procedure is fairly simple. You will need to disconnect the electromagnet from the EGR valve, remove the few screws that hold it in place, and remove it. Once these steps are completed, now comes the time for cleaning. To do this, you will need to use a product such as solvent, petrol, oven cleaning product, which you will leave to act for ten minutes, then scrape off the rest using a scraper, finish cleaning with wire brush. If you want to go further, you can also clean the two canal on which it is connected which may be scorched, for this, use a scraper and a vacuum cleaner to avoid dropping deposits in the conduits. You will only have to reassemble it and you will have finished cleaning the EGR valve of your Mazda CX 5.

Have it done by a professional

If, your EGR valve is not reachable because of the series or the engine of your car and if removing it would cause too many problems (removing too many elements that hinder access for example), how to clean the EGR valve of your Mazda CX 5? In this instance, it would be better rather than launching yourself into an overly complex procedure, you turn to an auto mechanic. He will be able to perform the job more cleanly and will be able, if necessary, to change the valve if it is dead. The cost of cleaning based on the difficulty of access is between 70 and 300 €.

Remove the EGR valve of your Mazda CX 5

At last, some individuals make a more radical decision to limit the risk of a failed valve. Rather than cleaning the EGR valve of their Mazda CX 5, they just choose to block it in the closed position. This modification will have the effect of greatly increasing the pollution emitted by the automobile, of no longer complying with pollution standards, of having an engine warning light permanently on and ultimately risk fouling the engine. We highly recommend against making this choice. If you have other questions or want to learn more about your car, don’t be reluctant to take a look at our dedicated page.

In the event that you have any further questions about the Mazda CX 5, do not hesitate to consult our Mazda CX 5 category.