4F0971839 Audi SHIELD

This thing basically protects a specific electrical connector – usually one going to a sensor or something similar – from dirt, moisture, and just general road grime. It’s often made of plastic, sometimes with a rubber gasket built in. It doesn’t do anything electrically, it just physically covers and safeguards the connection. Think of it as a little garage for an important electrical plug. It’s typically located somewhere exposed under the hood, or even underneath the vehicle. It doesn’t connect to anything except the connector it's meant to protect. It’s a cover, pure and simple. Different vehicles use different designs, of course, so it's important to get the right one for your make and model. This is one of those parts that you don’t even think about until it’s gone or cracked. When that connector is left exposed, corrosion sets in, and then you start getting intermittent signals, or the sensor stops working altogether. That can cause all sorts of issues, from a check engine light to really affecting how your engine runs. It acts like a shield against the elements. You'll notice if one is missing or broken because you might suddenly get a sensor code or performance issue. We’ve got a pretty good selection of these over at Fixparts Online if you’re looking to replace yours, and it’s usually a pretty straightforward fix. Better than the rest: Shield (MPN 4F0971839) is backed by a 12-month warranty!

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