PRIMARY · Reported for this vehicle
Ignition Coil
2 owner reports involving the ignition coil for this model year.
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Replacement Guide / Audi / A4 / 2005 / Engine Is Misfiring
2005 Audi A4
Engine Is Misfiring
Components worth investigating when a Audi A4 is misfiring, with owner-report evidence for the 2005 model year.
For the 2005 Audi A4
Engine Is Misfiring
Reported symptom
1 owner report for this model year describes the engine misfiring or running unevenly.
Misfire, shake, or uneven running can involve an ignition coil and sometimes related engine parts. A coil replacement without misfire language is not this job.
What should I investigate?
Components related to this situation, ranked by validated relationship, then by vehicle-specific owner-report evidence. This is not a diagnosis.
RELATED · Reported for this vehicle
Timing Chain
1 owner report involving the timing chain for this model year.
View replacement guideOther components that can be related
Generally associated with this situation, but no vehicle-specific evidence is present for this model year.
RELATED · Generally related
Catalytic converter
Generally associated with this situation, but no vehicle-specific catalytic converter evidence is present.
RELATED · Generally related
Oxygen Sensor
Generally associated with this situation, but no vehicle-specific oxygen sensor evidence is present.
RELATED · Generally related
Throttle Body
Generally associated with this situation, but no vehicle-specific throttle body evidence is present.
Questions that narrow it down
General checks. Answering them does not confirm the failed part on this vehicle.
Worth checking first
- A flashing check-engine light with a shake is a different path than a steady light with no drivability complaint.
- Do not treat a stall-while-driving report as a misfire unless the owner described misfire or uneven running.
Safety
When not to keep driving
- If the engine is shaking hard, a warning light is flashing, or you smell raw fuel, stop when it is safe. Continued misfire can damage the catalytic converter.
About the data
Counts come from replacement.guide aggregates for this model year. Component evidence comes from structured complaint categories and reviewed component mentions in complaint summaries. Owner-situation evidence comes from reviewed symptom language in complaint summaries. Reports are signals, not diagnoses.
How to read this page
PRIMARY components are the validated first-line associations for this job. RELATED components can be involved but are ranked after PRIMARY even when they have more reports. A report involving a component does not prove that component caused the problem.