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Some BMWs have multiple interior fuse boxes including in the trunk - the video above ... If your 325i has many options like a sunroof, navigation, heated seats, etc, the ... to be replaced or if there is a short or some other problem with your 325i.
hi the spark plugs will be under the cover on the engine on the left hand side, remove the caps holding the cover on and remove the 2 x 10mm nuts take off the cover and there you will find the spark plugs
Its usually directly on the speed selector know or mounted to the heater plenum behind the glove box (this is the prinicple for american cars sonot sure if foreign makers follow the same principle) its about 2"x2". Very small and looks like a microchip with a circuit and wiring in it...
The 2003 BMW 325i uses a coil-over-plug system, so the spark plugs are connected directly to the coils, deep in the cylinder head.
To get to the spark plugs:
Remove sound reduction or ignition coil covers as needed
Open control box cover
Disconnect ignition coil electrical connector by lifting up plug lock
Remove ignition coil by pulling straight up
Use the necessary tools to remove the spark plugs
There are six plugs, and the factory plugs that come with the car are most likely the NGK BKR6EQUP (laser platinum, 4-ground electrode) ... or if it's not the platinum version, the BKR6EKUB (a dual-ground electrode, semi-surface discharge type).
hi there the reason you don't see the plugs is that they will be under a coil pack or separate coils go are the days of plugs at the end of the plug lead there could be covers over them be logical the plugs will be in the head normally between the camshafts if it twin cam.
hope this helps you Regards JR
Locate the spark plug cover on the engine.On some Toyota Tacoma engines, the cover is across the top of the engine. On others, it is along the side 4 cyl. Remove the cover to reveal the ignition coils and spark plugs wires. The spark plug wires are plugged directly into the engine and the ignition coils are in the tip of the spark plug wire. Remove the coil and wire from the spark plug. Twist and pull the plug out of the engine. Remove the spark plug from the cylinder well with a socket extender and socket wrench. Turn the wrench to the left to unscrew the spark plug from the engine. Discard the old spark plug and apply a coat of anti-seize compound to the threads of the new spark plug. Insert the new spark plug into the socket. Use the socket and extension to screw the spark plug into place. Return the ignition coils and spark plug wires to the engine and turn it to lock the plug in place. Repeat the entire the process with the remaining spark plugs. Replace the spark plug cover when all of the spark plugs are replaced. Good luck and hope this helps and The spark plug tension may range between 11 and 15 foot pounds, depending on the size of the spark plug. The correct tension is indicated on the spark plug's packaging.