If One Fuel Injector Is Bad Should I Replace Them All?

There are affiliate links on this article. If you make a purchase through any of the links, I may earn a small commission at no extra cost to you.

If one fuel injector is bad should I replace them all? It is quite confusing when you’re faced with a situation such as this – you get stuck between changing all the injectors (which would cost more), or just change the faulty one. It’s a dilemma situation for many drivers, not just you.

A similar situation is when an ABS sensor becomes faulty. There are at least four ABS sensors in a car, and when one fails, it could be challenging to choose between changing the faulty one of all of them. Well, in this case of the fuel injector, let’s see what you should do.

If One Fuel Injector Is Bad Should I Replace Them All?

Let’s get straight to the point, replacing one fuel injector won’t save time and expenses, as you may think. How do we mean? When you confirm that one of your engine’s fuel injector is bad, apparently, you’d need to buy the injector and replace it.

Now, buying all the injectors at once would save you more money than buying just one. Also, it’d take almost the same amount of time for changing one fuel injector to change all of them; so, why spend so much time to get only one done when all can be done immediately?

Furthermore, if you’re having a mechanic carry out the changing, it would cost almost the same amount of money, for changing just one fuel injector, to change all of them at once.

This implies to say that it is better, cheaper, and advisable to change/replace all your car’s fuel injectors instead of replacing just one.

More so, if one fuel injector is bad, there’s the possibility that the other ones are on their way to getting spoilt anytime soon. So, to save the stress of dealing with fuel injector replacement many times in a short while, it is best to do it all at once.

But, what could cause a fuel injector to go bad, and what are the symptoms or signs that indicate your engine’s fuel injector is due for replacement?

Signs Of a Bad Fuel Injector

If One Fuel Injector Is Bad Should I Replace Them All

When you notice any of these signs, you should check out the entire system and components in the engine bay. This is because most of these signs also apply when some other critical engine component is failing.

  • The check engine light illuminates on the dashboard
  • Engine misfire
  • Fuel leaks, which would cause fuel-like odor
  • A significant drop in fuel economy

Fuel injectors may go become faulty, and subsequently, get damaged due to severe pressure and heat. Age is also one of the possible factors that can cause a fuel injector to go bad.

Recommended Readings:


So, if one fuel injector is bad should I replace them all? There’s nothing wrong in change the bad ones, but it is better and economical to replace all of them.

Fuel injectors play a vital role in regulating the flow of diesel to and fro, the engine. Hence, replacing it when it goes bad is necessary.

Scroll to Top