What Happens When Your Audi A4 2.0 TDI EGR Valve Goes Bad?
The EGR valve is a critical emission control unit found on virtually all modern cars.
Its job is to prevent NOx formation within the combustion chamber.
And, to do so, it recirculates a portion of exhaust emissions back into the engine.
If it goes out, you would encounter all sorts of performance issues.
Luckily, diagnosing and fixing a defective EGR valve in your Audi A4 is quite simple.
Signs your Audi A4 EGR valve is failing
Check engine light is on
Blinking check engine light is a telltale indicator that your EGR valve is going out.
Take your Audi A4 to a nearby auto service center to find out what’s wrong.
Declining engine power
If your Audi A4 feels sluggish when accelerating, chances are its EGR valve is failing.
In the worst-case scenario a defective EGR valve can cause complete engine failure.
Therefore, get it tested and if it is faulty, consider replacing it.
Bad gas mileage
A common reason for a sudden drop in gas mileage is a malfunctioning EGR valve.
There are several other reasons why your Audi A4 may get poor gas mileage.
Oftentimes, you will need an experienced mechanic to diagnose the exact issue.
Failing emissions inspection
Your Audi A4 will fail an emissions test if its EGR valve is not functioning properly.
Get it tested and if necessary replace it.
Stalling and misfiring
Engine stalling is often the sign of a faulty EGR valve.
Issues with the EGR valve can make your Audi A4 engine misfire and idle rough.
For a true understanding of what’s going on with your engine, get it tested.
Wrapping Up
The EGR valve is designed to minimize NOx formation within the engine.
If it goes out, your Audi A4 may fail an emissions test.
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