Mercedes E420 Starter Relay Parts
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The average cost of a Mercedes E420 starter relay is between $9.59 and $13.09.
Where Is The Mercedes E420 Starter Relay Located?
The Mercedes E420 starter relay sits in the main fuse box under the hood, usually close to the driver’s side fender. Some years tuck it further in—sometimes behind the battery, or pressed up against the passenger-side firewall. Open the hood and pop the fuse box cover. Look for the diagram inside the lid, which points out relays and fuses by number and symbol. The starter relay looks like a small plastic cube among the other relays. If you’re stuck, your owner’s manual will point you to it, or you might have to check a diagram that matches your car’s year. Take care when lifting out the relay—prongs can bend or snap if you pull too hard.
What Are Common Symptoms Of A Bad Mercedes E420 Starter Relay?
When the starter relay on your Mercedes E420 goes out, the car might act completely dead no matter what you try. You could turn the key and get only silence—or maybe a single click under the hood. Sometimes things seem normal, but nothing fires up. On other days, it might catch after a few tries, only to leave you stranded later. Some drivers lose dashboard lights too, since the relay can kill power flow to the rest of the starting system. On rare days, you could get a surprise crank or a drained battery, but most often, it’s the engine refusing to start at all. Catching this early helps—nobody wants to get stuck in a parking lot, hoping for a jump.
How Much Does It Cost To Replace A Mercedes E420 Starter Relay?
For most models, a starter relay won’t break the bank. A new relay hits between fifteen and forty bucks, depending on the brand. Labor is light—shops charge fifty to a hundred dollars for the swap, since it’s a quick job. If you can use a socket set and aren’t afraid to disconnect the battery, you can do it yourself and skip the shop fee. Always unplug the battery first to keep things safe. Compared to some car repairs, this one is light work and easy on your wallet.
How Do I Test My Mercedes E420 Starter Relay?
Testing the starter relay on your E420 isn’t hard if you have a multimeter. Unplug the relay with the car off and the battery out. Scan for burn marks, melted plastic, or green corrosion on the prongs—trouble signs. Look up the relay’s pin-out online or in your manual, then touch the leads with your meter to check for continuity. Some people borrow a matching relay from something less critical, like the horn, and swap it in. If the car starts, your old relay is finished. Take your time—rushing can cause shorts or break connectors you weren’t planning to replace.
Can I Bypass The Mercedes E420 Starter Relay Temporarily?
You can bypass the starter relay for a test, but it’s risky. With a jumper wire, touch the input and output slots in the relay socket. If the starter spins, you’ve likely found your problem. Still, don’t leave it bypassed. Jumping the relay can overheat wires or even cause a fire if you slip. Use this as a test, not a fix. Always disconnect the battery before poking around, and replace the relay as soon as you can. A real repair beats limping along with a shaky workaround.
Why Choose AutohausAZ For Your Mercedes E420 Starter Relay?
Car won’t start, or just keeps clicking? We’ve been there, and that’s why AutohausAZ keeps things simple. Prices stay low—way lower than dealer rates—so you don’t waste time hunting for bargains. We ship fast, too; nobody wants to wait while their car sits idle. Not sure if you got the right part? Returns are smooth, and our team is ready to help if you have questions. No stress, no mysteries—just the right part to get you back on the road. We’ve got an easy lookup tool, a warehouse full of E420 parts, and a support crew that actually picks up the phone. For new DIYers or grizzled veterans, you can trust every order is packed with care. Fix your Mercedes with confidence—you’re covered with AutohausAZ.
