2009 bmw 328i key fob battery replacement

If your BMW remote key fob is not unlock doors perfectly, the battery likely needs to be replaced. Yes, it is possible to replace the battery in your keyless entry remote by yourself. All tools, that you need is described below.

What kind of battery remote key fob use

• glue
• 1xCR2450 battery
• flat head screwdriver
• razor knife

Step by step instruction

Inside of your keyless entry remote installed coin cell battery. Remove any internal key first, and then try to pry apart the key fob. To disassemble this remote key fob you need scoring the edges with carpet knife first.

Delicately try to pry apart your fob with pry tools. Change one CR2450 battery with flat head screwdriver.

Get new battery and install it in fob’s body. Be sure to connect the battery the right way around in a circuit. Your key fob will not work if you place battery wrong way.

Before assembling fob’s case, verify that all functions works by testing buttons on keyless entry remote.

The last thing to do is put your cover back on fob. Accurately try to assemble the pieces in place by hands from top to bottom. If your keyless entry remote body firmly closed, we done. If not, repeat the last step. Glue the back of the keyless entry remote.

Video of remote key fob disassembly

BMW KEY FOB REMOTE BATTERY Change Replacement 328i 330i 335i 528i 535i Exact Solution

Still not working? Buy new one

FAQ

What size of battery does a 2009 BMW 3-Series remote key fob require?

Key fob of BMW 3-Series require 1xCR2450 batteries. Price for CR2450 batteries are under $6 build upon the type, brand and size packaging you buy. You can take old battery to the store, with you to find a proper replacement.

Does a key have to be reprogrammed after changing the battery?

Keyless entry remote in most of cases do not need to be reprogrammed after battery change. If your key fob not working, recheck new battery voltage. If it is not help, read user's manual or contact local dealer.

Is it hard to replace battery in key fob yourself?

Replacing your key fob battery is simple to do in 2009 BMW 3-Series. Most of car manufacturers think of the customers and make a special hole for remote key fob open.

Is it better to go to dealer for replace a fob’s battery?

The price to change the battery inside fob is in range $50-600 depending on the brand and the service pricing.

How regularly should keyless entry remote batteries be replaced?

You should replace batteries inside key fob of modern cars at least once in 4 years. lifespan of battery vary on frequency of use, quality and operating conditions.

How do you realize if your key fob needs a new battery?

These symptoms will warn you that it's possible time to replace battery in your BMW 3-Series: signal strength reduced, key fob buttons not working, low key battery indicator on dashboard and you didn't change battery more than 4 years.

Normally I would feel like a dumbass for even asking this, but does anyone know how to remove/ replace the battery in the key fob? I looked in the manual on page 38, and the picture it shows is not the same as my remote. It implies there is a little cover on the back, and there is not. Most key remotes have a little notch you can open with a dime or something. I see nothing on our key fob. The remote seems pretty tight together, I don't want to f*ck it up with my big meat skinners. Next step is to take to dealer I guess.

Jerry partners with more than 50 insurance companies, but our content is independently researched, written, and fact-checked by our team of editors and agents. We aren’t paid for reviews or other content.

One for the intake camshaft and one for the exhaust camshaft, mounted to the front of cylinder head. They are responsible for direct oil flow to the VANOS actuator and can become restricted over time on high mileage engines. You can clean or replace the solenoids quite easily if needed. My suggestion is if you have determined you need a VANOS solenoid by cleaning or swapping side to side, replace both solenoids. They are fairly economical and you're always better off replacing a degrading part. The sealing O-ring for the VANOS solenoid can also leak. If you have an oil leak down the front of cylinder head, inspect solenoid area for fresh oil.

Inspecting VANOS solenoids once removed: Check VANOS solenoid for cleanliness and or debris. Clean both solenoids and reinstall. If the fault code for camshaft position sensor goes away or swaps position from intake to exhaust (or vice versa), the fault code is being caused by the VANOS solenoid. Replace the solenoid that the code followed. Here are fault codes you may have if a VANOS solenoid is causing your problem, 2A9A Cam sensor, inlet signal invalid for synchronization, 2A98 (P0016) Crankshaft intake correlation value outside ref range, 2A82 intake VANOS jammed mechanically, 2A9B exhaust camshaft sensor signal invalid for synchronization, 2A99 (P0017) Crankshaft position sensor and exhaust camshaft, correlation value outside reference range, 2A87 exhaust VANOS jammed mechanically.

In this article, I'll go over the steps involved with replacing the VANOS solenoids on BMW E90 models. Be sure to work with a cool engine. Replacing the VANOS solenoids is similar for both. I will highlight how to replace and clean the exhaust VANOS solenoid.

Remove engine covers. See our tech article on engine cover removing.

CLICK HERE FOR PARTS FOR THIS ARTICLE:

CLICK HERE FOR BMW E90 PARTS

Check out our complete Technical Article Directory for guides to many other procedures.

Check out our Basic Maintenance section, which has all the parts you'll need to get your vehicle running its best, including filters, fluids, brakes, spark plugs, lighting, and more for your E90! 

What battery does a BMW 328i key take?

How do you charge a 2009 BMW key fob?

What battery does a BMW key fob take?