Audi A8 Quattro Fuel Injector Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(108)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(108)

Fuel Injector Replacement Service

How much does a Fuel Injector Replacement cost?

On average, the cost for a Audi A8 Quattro Fuel Injector Replacement is $1328 with $1129 for parts and $199 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1999 Audi A8 QuattroV8-4.2LService typeFuel Injector ReplacementEstimate$3780.14Shop/Dealer Price$4701.56 - $7383.12
2012 Audi A8 QuattroV8-4.2LService typeFuel Injector ReplacementEstimate$5571.40Shop/Dealer Price$6936.28 - $10853.41
2008 Audi A8 QuattroV8-4.2LService typeFuel Injector ReplacementEstimate$2457.02Shop/Dealer Price$3058.22 - $4778.98
1998 Audi A8 QuattroV8-4.2LService typeFuel Injector ReplacementEstimate$3738.14Shop/Dealer Price$4659.54 - $7341.08
1997 Audi A8 QuattroV8-4.2LService typeFuel Injector ReplacementEstimate$3738.14Shop/Dealer Price$4659.68 - $7341.33
2015 Audi A8 QuattroW12-6.3LService typeFuel Injector ReplacementEstimate$8250.34Shop/Dealer Price$10284.94 - $16211.27
2013 Audi A8 QuattroV8-4.0L TurboService typeFuel Injector ReplacementEstimate$6316.66Shop/Dealer Price$7861.15 - $12319.54
2002 Audi A8 QuattroV8-4.2LService typeFuel Injector ReplacementEstimate$4704.12Shop/Dealer Price$5865.34 - $9264.21
Show example Audi A8 Quattro Fuel Injector Replacement prices

What is a fuel injector and how does it work?

A fuel injector is a fuel metering device that sprays atomized droplets of fuel in a specific pattern into the engine’s intake manifold or directly into the combustion chamber. The injector has a solenoid and valve within and the operation, or pulsing, of the solenoid is controlled by the powertrain control module (PCM). The PCM controls the solenoid’s “on” time in order to keep the air-fuel ratio optimized while the engine load and operating conditions constantly change. Fuel injectors are usually connected to a fuel rail located on the top of the engine and the fuel rail, in turn, is supplied with fuel under pressure from the fuel pump located in the fuel tank.

When to consider replacing a fuel injector:

  • Rough idle, loss of power, or misfiring. Poor engine operation has many causes but faults in the fuel injection system, including the fuel injectors, are high on the list of possibilities.
  • Odor of raw gas or visible leaks. Fuel injectors should not leak fuel into the intake manifold when the car is off. If you notice any fuel odor around your car, the possibility of a leaking fuel injector should be considered. There should be no external leak from a fuel injector. If an externally-leaking injector is suspected, do not start your car due to the fire hazard.
  • Check engine light. Some fuel injection failures, for example, a faulty solenoid, may cause a trouble code to be set in the PCM and that will cause the check engine light to illuminate. The codes are read and the fuel injector is tested directly, as needed.
  • Major engine repairs, engine replacement, or lengthy storage. All fuel injectors will have deposits given enough mileage. These deposits can cause an imbalance in the performance of the injectors from cylinder to cylinder. When an engine is already disassembled, or if you are installing a new engine, that is a perfect time to service the injectors as a set. All injectors have tiny internal filter baskets. A professional injector service facility will clean each injector ultrasonically and replace these filters for a relatively low cost.

How do mechanics replace a fuel injector?

Injectors can be serviced once removed from the car or replaced outright with new injectors. If the injectors are serviced, specialized cleaning and test equipment are required. The choice to repair versus replace will depend on exactly what is wrong with the injector as well as customer preference. Either option requires removing the injector from the car and the following procedure is typical:

  • Once the engine is cold, the pressure within the fuel rail is relieved by briefly running the engine with the fuel pump fuse out.
  • The upper plenum on the intake manifold is removed along with any cables, hoses, or wiring that restricts access.
  • The supply and return lines are removed from the fuel rail. The electrical connectors to each fuel injector are unlocked and removed. The fuel rail is then unbolted and removed from the intake manifold.
  • The injector(s) requiring replacement are removed from the fuel rail, taking care to not allow any debris to enter the exposed openings. An O-ring seal usually holds the injector very firmly in a finely polished bore in the fuel rail.
  • Using a new O-ring, the serviced or replaced injector is re-inserted into the fuel rail — using engine oil on the O-ring to prevent damaging it. O-rings in this application fit very tight to prevent fuel leaks.
  • The fuel rail is re-installed and the supply and return lines are re-connected. The plenum is re-installed along with all cables, hoses, or wiring.
  • Finally, the engine is run, there is a careful check for leaks, and the vehicle is road tested.

Is it safe to drive with a fuel injector problem?

Yes, so long as there is no external leak of fuel from a broken or malfunctioning injector, it is safe to drive the car. However, if the injector is known to be malfunctioning, it can cause engine misfires, excessive emissions or, in the case of a badly leaking injector, can overload and overheat the catalytic converter. Additionally, fuel efficiency will always be diminished if the fuel injectors are not working properly.

When replacing a fuel injector keep in mind:

  • Using high quality (Tier One) gasoline may reduce deposits on fuel injectors and prolong their life.
  • If an injector problem develops that requires removal of one injector, the best practice is to remove and service all of the injectors at the same time. That service might involve replacement of the electrically failed injector along with off-the-car cleaning of the remaining injectors. Serving all injectors at once ensures the injector set will be balanced, in terms of flow rates, and in turn promote smooth operation of the engine.
  • Do not use fuel system cleaning compounds, or procedures, unless such materials are specified by the manufacturer of your car.
  • On the car cleaning of fuel injectors is not as effective as off-the-car cleaning because injectors have tiny internal filter baskets that should be replaced as part of the process of servicing a fuel injector.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Audi mechanics

Real customer reviews from Audi owners like you.

Excellent Rating

(108)

Rating Summary
101
1
1
0
5
101
1
1
0
5

Jay

23 years of experience
149 reviews
Jay
23 years of experience
Audi A8 Quattro V8-4.2L - Car is not starting - Maywood, Illinois
Very thorough

Andrew

25 years of experience
150 reviews
Andrew
25 years of experience
Audi A8 Quattro V8-4.2L - Intake Manifold Gaskets - Loganville, Georgia
Great guy all around!!!! Thanks Andrew.

Joseph

20 years of experience
640 reviews
Joseph
20 years of experience
Audi A8 Quattro V8-4.2L - Headlight Bulb Replacement (Driver Side Low Beam) - Salt Lake City, Utah
Joseph is fast and officiant. I love the convenience of this business and will use it again!

Roberto

12 years of experience
9 reviews
Roberto
12 years of experience
Audi A8 Quattro V6-3.0L Turbo - Oil Change - Upper Darby, Pennsylvania
Timely good communications

Excellent Rating

(108)

Rating Summary
101
1
1
0
5
101
1
1
0
5
Number of Audi A8 Quattro services completed
1188+
services done by our mechanics
TOTAL NUMBER OF EXPERT Audi MECHANICS
700+
experts on our platform

Recent articles & questions

How Long Does a Windshield Wiper Blade Last?
Driving Driving in the rain or snow is not easy and will require the right equipment. There are a variety of things on your car that will allow you to stay safe during situations like this. Among the most important...
The Guide to Legal Car Modifications in Nebraska
ARENA Creative / Shutterstock.com If you live in Nebraska or plan to move to the state and you have a modified vehicle, you need to know the laws and regulations to make sure your car or truck...
How to Keep Your Car Running Well When It’s Hot Outside
Your Your car is affected considerably by the environment around it, including: Cold, freezing temperatures Dry, arid climates Hot temperatures and direct sunlight Precipitation in the form of rain or snow If your car is exposed to moisture all the...

How do I use the express windows?

The express power windows make it easier for you to open or close your windows. To use the express power window feature, press the window switch all the way down, or pull the window switch all the way up, and...

Accelerating

If your Check Engine Light is on, you could have a misfire (https://www.yourmechanic.com/services/engine-is-misfiring-inspection) caused by a faulty ignition component. It could also be caused by improper timing, if the timing belt (https://www.yourmechanic.com/services/timing-belt-replacement) jumped a tooth. It could also be caused...

Do you have a Audi Certified Mechanic?

Braking systems are practically uniform insofar as the technology across all models these days and specific model certification is substantially irrelevant for repair of this particular vehicle system. What is relevant is whether the mechanic you select actually follows service...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com