Fuel injector AUDI A4 1999

OEM: 058133551F

Disassembled car photo

Engine running

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What is this part and why does it matter?

The fuel injector sprays a precisely metered, atomised amount of fuel into the cylinder or intake port at the exact right moment for efficient combustion.

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Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

  • Rough idle or misfire on a specific cylinder
  • Poor fuel economy
  • Check Engine light with an injector-related fault code
  • Fuel smell or a leak visible at the injector

Installation information

Requires relieving fuel system pressure before removal — always fit a new sealing O-ring/washer when installing.

Frequently asked questions

A faulty injector delivers too much, too little, or unevenly atomised fuel to its cylinder, disrupting that cylinder’s combustion and causing a noticeable misfire or rough running.

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