RepairSmith offers upfront and competitive pricing. The average cost for Mercedes-Benz E300 Fuel Injector Replacement is $616. Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you.
For one thing, you can monitor for other symptoms of a bad injector along with the CEL. However, you should consult your mechanic to be sure. They’ll use an OBD2 scanner to identify the issue.
3. Fuel Leak And Odor
A cracked or old injector can cause a fuel leak. This could be due to damage from wear and tear or old age. Whatever the case, it can result in gasoline leaking from the main body instead of reaching the injector nozzle.
If you physically inspect the fuel injector, you’ll notice traces of gasoline on its exterior body or near the fuel rail. It will also reflect a strong gasoline smell due to the leak.
A damaged old injector could also leak too much fuel into the cylinder, cause incomplete combustion, and foul the spark plugs.
4. Reduced Fuel Efficiency
When the fuel injector fails to provide the engine with the sufficient amount of fuel it needs, the engine acts up in response. It will continue to put more pressure on the injector for more fuel injection than it needs.
This affects the car’s fuel efficiency and consumption as the engine demands more fuel than the ECU thinks it needs.
5. A Failed Emissions Test
A broken or leaking fuel injector can cause insufficient or incomplete fuel combustion. Naturally, this results in increased emissions by the car.
In some cases, a fuel injector leak can also end up burning the catalytic converter. So a failed emissions test could potentially indicate a faulty fuel injector.
How Much Does A Fuel Injector Replacement Cost?
The cost of your fuel injector replacement will depend on the make and model of your vehicle. Generally, replacing fuel injectors can cost anywhere from $800 to $1500 depending on the repairs and labor costs.
New fuel injector parts can cost anywhere between $600-$1200. To that, expect to pay about $200-$250 in labor charges.
However, note that you don’t always need to replace the fuel injector. Sometimes, your mechanic may simply recommend a thorough cleaning of the fuel injection system.
How Urgent Is A Fuel Injector Replacement?
While you can drive with a faulty fuel injector for a limited amount of time, you really shouldn’t.
Eventually, a faulty fuel injector will cause incomplete fuel burn and severely affect the engine performance. A bad fuel injector can also potentially damage the car’s spark plugs and foul them. It can even lead to engine failure and cost you thousands in repair.
4 Fuel Injector Replacement FAQs
Let’s go through some frequently asked questions related to a fuel injector replacement, and their answers:
1. What Is A Fuel Injector?
The fuel injector is an electronically controlled mechanical device that plays a key role in the combustion of the air-fuel mixture. As the name suggests, the fuel injector ‘injects’ the fuel into the engine to prepare the air-fuel mixture for combustion.
Here’s how it works:
The fuel injector is located in the intake manifold injection, just before the inlet valve.
When you press the gas pedal, your car’s throttle body coordinates with the fuel injectors.
The throttle valve cover opens, and your fuel injector sprays fuel that mixes with the added air.
The air-fuel mixture then enters the engine’s combustion chamber, which is ignited for combustion.
2. What Causes Fuel Injectors To Go Bad?
Most fuel injectors are made to last for over a billion cycles. This would mean that most car owners never have to worry about getting new fuel injectors.
However, it’s possible to get a faulty fuel injector as driving conditions or vehicle type can influence its durability and lifespan.
As with most parts, the primary cause behind a faulty injector can be wear and tear. As the fuel injector gets old, it can get dirty and clogged around its valve cover and injector nozzle.
That said, there are a few factors that could cause premature fuel injector failure.
Driving conditions and habits (heavy towing, stop-and-go driving, etc.)
Poor fuel quality that can lead to debris contamination in the fuel system
Lack of preventative maintenance and regular inspections
3. How To Replace A Fuel Injector?
Fuel injector replacement can be a complicated process to perform on your own. So unless you have a good grasp of how these parts work, it’s best to leave the fuel injection replacement to professional mechanics.
That being said, here’s a general walkthrough for a fuel injector replacement:
Before proceeding with fuel injector replacement, it’s important to relieve the fuel system pressure. This is done by disconnecting the fuel line (hose) and the fuel rail.