What It Is
An EGR valve for the Mk4 ALH engine, manufactured by Wahler, cross-referenced to Pierburg part number 045131501C.
What This Valve Does
The EGR valve recirculates a small amount of exhaust back into the combustion chambers, lowering combustion temperature and reducing the formation of smog-producing nitrogen oxides.
Signs of a Failing Valve
A failed EGR valve often shows no obvious symptoms beyond a check engine light, but it causes the engine to run less efficiently and produce higher emissions in the meantime.
A Note on Compatibility
This part may also work in other applications using the same part number, but verify the indicated part number against your car before ordering.
Fitment
1999-2003 Mk4 Golf and Jetta TDI, and 1998-2003 Mk4 New Beetle TDI, all with the ALH engine.
Common Questions
How do I know if my EGR valve has failed?
Often the only sign is a check engine light, even though the engine is running less efficiently and producing more emissions in the background.
Is this a genuine OEM part?
It's manufactured by Wahler and cross-referenced to Pierburg part number 045131501C, a common OE-equivalent source for this valve.
Does this fit other VW models beyond the listed ALH cars?
It may, but verify the part number against your specific car before ordering, since this valve is used across several VW applications.
