Homeall bmw modelsBMW Coil Socket Housing Replacement - All BMW Models 2003-2016

BMW Coil Socket Housing Replacement – All BMW Models 2003-2016

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Repair Summary
The following article shows in detail how to replace the coil socket housings in BMW vehicles with "pencil type" ignition coils. The "pencil type" ignition coil is found in all BMWs manufactured from 2003-2016. Even though this article uses a 2006 530xi (E61) to perform the procedure, it can be applied to any other BMW vehicle with the same coil type.

A BMW coil socket housing replacement may be necessary if they have been changed to a newer part number.

We are not gamblers here at the Repair Guide (some of us gave up betting college football years ago), but we are willing to wager a pretty penny that you are reading this article because you just started a tune-up and realized your new coils don't fit. Hmmm...well according to your supplier they should fit. But you can't seem to slip the socket housing onto the coil. Insert your expletives here.
A BMW "pencil" style coil
Well, don't feel bad. We recently encountered the same situation on our 2006 530xi touring wagon during its first tune up since purchased in July 2019. A quick analysis of the issue on RealOem.com revealed the problem. In 2016 BMW discontinued a coil socket housing that affected just about every model produced between 2000 and 2016 (part number 12521437985). The discontinued socket housing does not fit newer coils and must be switched out with the updated version (part number 12527519996) when the vehicle is brought in for a tune-up.
Discontinued coil socket housing
Discontinued coil socket housing - notice the offset groove in the bottom. This socket housing will not fit newer coils.
New coil socket housing - fits all new replacement "pencil" style coils.
There may be other reasons requiring a BMW coil socket housing repair, including fixing broken cable harnesses or replacing their worn parts. These reasons, although possible,  are unlikely since most mechanics will just install a new cable harness that already includes the updated socket housings.
Whatever the reason is for replacing your socket housings, it is important to remember that this repair requires disconnecting your battery before starting. DO NOT attempt any repair on your vehicle's ignition system without removing the negative terminal from the battery...you can destroy sensitive electronics and cause catastrophic damage.
View the detailed parts diagram for this repair.
Includes detailed part diagrams, part numbers and links to purchase all of the required components needed to complete this repair.
Before starting this repair, you must have the following required parts.
Commonly used in many different models.
These are the newer style coil socket housings that fit most "pencil" style replacement coils.
category = 5986
Repair Steps
Section 1 - Preparing for a BMW Coil Socket Housing Replacement
This repair applies to just about every model BMW produced with "pencil" style ignition coils, so it is not feasible for us to illustrate every application. Preparing for the repair usually requires removing the cabin filter assembly, moving cable and wiring harnesses, and removing engine covers to expose the vehicle's ignition coils. For more information on accessing your vehicles ignition coils, please refer to other articles on our site or reference a quality BMW repair manual like Bentley Publishers.
Section 2 - Replacing the Ignition Coil Socket Housings
  1. Before starting a BMW coil socket housing replacement, remove the negative terminal from the battery. Never attempt any work on your engine's ignition system without removing the negative terminal to the battery first...you can cause catastrophic damage to sensitive electronic parts.disconnect negative terminal from battery
  2. Start by removing the coil packs on your vehicle by releasing the socket housings from the coils, and "pulling" the coils from the spark plug tubes. A socket extension works great if the coils are stuck.bmw coil socket housing replacement - locate coil packsbmw coil socket housing replacement - remove socket housings bmw coil socket housing replacement - remove coils from spark plug tubes
  3. There are special tools on the market for removing and installing electrical connectors in socket housings, but using just a 3/64" (1.5mm) and 5/64" (2mm) flat blade screwdriver will get the job done.A 3/64 A 5/64
  4. Start by inserting a 3/64" screwdriver into the side of an old ignition coil socket housing and releasing the triangular plastic retaining clip that secures the ignition wires.bmw coil socket housing replacement - release plastic clip bmw coil socket housing replacement - release plastic clip
  5. Insert the 3/64" flat blade screwdriver into one of the connections and push it out of the back of the socket housing. This is not always that easy...sometimes you may need to use the palm of your hand on the screwdriver to get the connector to release. Use patience. Continue pushing until the connector pops out of the back of the housing.
  6. Check to see if the connector was bent when removed from the old socket housing. Usually they just pop out and everything is fine...but if you had to use a lot of force to remove it (or if you had to manipulate it to get it out) plug it into the back of a coil to see how it fits on the metal leads. If it is loose or does not slide on the lead correctly, use your screwdrivers and/or a pair of needle nose pliers to make small adjustments until it fits correctly.
  7. We like to immediately install the connector we just removed into the new socket housing. This helps avoid mixing up the wiring order. Make sure the triangular plastic retaining clip on the new socket housing is released before installing the connectors.
  8. Push the connector into the new socket housing as far as you can with your fingers. Use a 5/64" (2mm) flat blade screwdriver to "push" the connector from the back of the socket housing. Try and keep the blade of the screwdriver on the rubber insulation while pushing to avoid puncturing the wires. Keep pushing the connector into the new socket housing until it is in its proper position (see images below).bmw coil socket housing replacement - push connector into new socket housing Proper connector alignment in new housing
  9. When all three connectors have been properly installed in the new socket housing, lock the triangular retaining clip back in place.bmw coil socket housing replacement - lock retaining clip on new socket housing
  10. Repeat for the remaining coils. Replace the coils in the spark plug tubes and start the vehicle to make sure there are no misfires. If there is a misfire (or engine is running rough), check all of you connections to make sure they are tight. If engine is still running rough, you will have to hook up an diagnostic scanner to check which cylinder(s) is causing the issue. Pull the socket housing off the misfiring cylinder and confirm you have all of the connector leads in their proper position and there are no broken wires.
BMW Coil Socket Housing Replacement Finished
Genuine BMW Ignition Coil - Priced Each
Part #: 12138647689
Genuine BMW Ignition Coil - Priced Each - N20 N52 N54 N55 S55 S54 N62 S62 M54
Part #: 12138616153
Genuine BMW Ignition Coil with Spark Plug Connector (ELDOR)
Part #: 12138657273
Genuine BMW Ignition Coil - Priced Each
Part #: 12137841556
Meistersatz Spark Plug Pipe - Priced Each
Part #: 11127570219
CTS High Performance Ignition Coil - Priced Each
Part #: cts-ign-008
Genuine BMW Ignition Coil - Set Of Six
Part #: 12138616153s6kt
Bosch Ignition Coil - Priced Each
Part #: 0221504474
URO Ignition Coil - Priced Each
Part #: 12139066468
Genuine BMW Ignition Coil Hold Down - Priced Each
Part #: 12131437986
Bavarian Autosport Ignition Coil - Priced each
Part #: 12131703359a
Bremi Ignition Coil - Set Of 6
Part #: 12138616153sbkt

All BMW Models

The Level of Difficulty displays graphically how challenging the repair is, from beginner to expert. Beginner repairs usually require very few tools, have short repair times and are simple to complete for even the most novice of mechanics. As the difficulty level rises expect the repair to demand more time, use more specialized tools, and require a better understanding of mechanics to complete the job.

The Repair Cost graphically displays approximately how expensive the repair will be to perform. The repair cost is defined as the actual money that would need to be spent to purchase required parts and special tools that would not be normally found in the home mechanics garage. Please note that these cost estimates are approximate and can fluctuate based on brand preferences and manufacturer.