Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2004325CI CONVERTIBLE (E46) L6-2.5L (M54)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
2004 BMW 325Ci Convertible (E46) L6-2.5L (M54)
Spark Plug: Service and Repair
2004 BMW 325Ci Convertible (E46) L6-2.5L (M54)SECTION Service and Repair
Replacing All Spark Plugs
Special tools required:
- 12 1 171
- 12 1 200
NOTE:
This repair instruction is valid for the following engines:
- M52 / M52TU / M54 / M56
- S52 / S50US
Necessary preliminary tasks:
- Remove ignition coils. Service and Repair
Unscrew and remove spark plugs with special tool 12 1 171 in conjunction with special tool 12 1 200.
Installation:
If special tool 12 1 200 is not used,
Tightening Torque
1AZ Spark plugs (ungreased)
M12x1.25 23 ±3 Nm
M14x1.25 30 ±3 Nm
RENDER: 1.0x
NO RELATED
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.