Audi S4 Fuel Injector Replacement Costs

Estimate price near me

Service Location

Customer Ratings

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.

See availability

Customer Ratings

Fuel Injector Replacement Service

How much does a Fuel Injector Replacement cost?

On average, the cost for a Audi S4 Fuel Injector Replacement is $1272 with $1076 for parts and $196 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2006 Audi S4V8-4.2L	Service typeFuel Injector Replacement	Estimate$3175.80	Shop/Dealer Price$3928.10 - $6156.65
1992 Audi S4L5-2.2L Turbo	Service typeFuel Injector Replacement	Estimate$2357.35	Shop/Dealer Price$2902.00 - $4521.54
2000 Audi S4V6-2.7L Turbo	Service typeFuel Injector Replacement	Estimate$3263.44	Shop/Dealer Price$4021.97 - $6278.74
2002 Audi S4V6-2.7L Turbo	Service typeFuel Injector Replacement	Estimate$3012.08	Shop/Dealer Price$3707.77 - $5776.01
2005 Audi S4V8-4.2L	Service typeFuel Injector Replacement	Estimate$3606.09	Shop/Dealer Price$4468.17 - $7028.19
2014 Audi S4V6-3.0L Turbo	Service typeFuel Injector Replacement	Estimate$3750.74	Shop/Dealer Price$4634.88 - $7268.17
2010 Audi S4V6-3.0L Turbo	Service typeFuel Injector Replacement	Estimate$3119.74	Shop/Dealer Price$3845.60 - $6005.24
2009 Audi S4V8-4.2L	Service typeFuel Injector Replacement	Estimate$3163.93	Shop/Dealer Price$3910.31 - $6134.84

Show example Audi S4 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

(79)

Rating Summary

73

1

0

1

4

73

1

0

1

4

SEE REVIEWS NEAR ME

Jamahl

21 years of experience

830 reviews

Jamahl

21 years of experience

by Matthew

Audi S4 V6-2.7L Turbo - Brake Rotor/Disc Replacement (Front) - Orlando, Florida

Jamahl was very good with communication. Stayed on top of things from start to finish. Would highly recommend him for your next service.

Theodore

17 years of experience

1794 reviews

Request Theodore

Theodore

17 years of experience

Request Theodore

by Andrew

Audi S4 V6-3.0L Turbo - Oil Change - Bellevue, Washington

Great service as always.

Lavell

29 years of experience

405 reviews

Lavell

29 years of experience

by Oddae

Audi S4 V8-4.2L - Car is making a noise - Pinole, California

Lavell was great & found out what’s wrong with my vehicle quick. I highly recommend him again.

Joe

16 years of experience

453 reviews

Joe

16 years of experience

by Cindy

Audi S4 V8-4.2L - Gas Cap - Nashville, Tennessee

Once he arrived he stayed to give a thorough inspection and possible options for car (our need could have been other things as well). Had the right part. Definitely recommend Joe and recommend the service.

Excellent Rating

(79)

Rating Summary

73

1

0

1

4

73

1

0

1

4

SEE REVIEWS NEAR ME

Recent articles & questions

C1095 OBD-II Trouble Code: ABS Hydraulic Pump Motor Circuit Failure

Trouble code C1095 means the ABS hydraulic pump motor circuit has failed, often because of a damaged wheel speed sensor or wheel bearings.

How to Get Smog Technician Certified in Illinois

Automotive technician jobs include smog certified emissions inspectors. In Illinois, you apply and train directly with Applus to become an inspector.

10 Best Stores to Buy Auto Parts in Austin, Texas.

Automotive technicians rely on auto parts stores to add and replace car parts. The best auto parts shop in Austin is ATX Auto Sport.

How do I turn on the radio?

With the infotainment system turned on, press the Band button to turn on the radio. Pressing the Band button will cycle through AM, FM, and XM radios. Press the Band button until you are on the radio setting that you...

Haven't driven car in 2 years and I need to smog it to validate my registration

Buy a brand new battery that is fully charged prior to installation so that you do not needlessly load the alternator. Change the engine oil and filter. Ideally, you should pressurize the oil system (https://www.summitracing.com/parts/mel-mpl-101?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-melling&gclid=CMad36nQ_tECFR61wAodtbMCkg) prior to starting, otherwise you...

Wire and metal hanging underneath car

Hi there. It is probably a better idea to have one of our mobile mechanics to come to your location and complete a physical inspection if you notice any symptoms as there isn't anything natural that would hand from below...

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 (844) 997-3624 · hi@yourmechanic.com