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.

2012 Lexus GX 460FACTORY OEM SERVICE PROCEDURE

Ignition Coil And Spark Plug: Removal: Removal

REMOVE V-BANK COVER SUB-ASSEMBLY . Refer to REMOVAL - Step 15
REMOVE AIR CLEANER CAP AND HOSE . Refer to REMOVAL - Step 23
REMOVE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
REMOVE AIR CLEANER CASE SUB-ASSEMBLY . Refer to REMOVAL - Step 25
REMOVE IGNITION COIL ASSEMBLY
1. for Bank 1:
  Remove the 4 ignition coils.
  1. Detach the clamp and disconnect the engine wire.
    
    Fig 1: Identifying Ignition Coil Connectors (Bank 1)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Disconnect the 4 ignition coil connectors.
  3. Remove the 4 bolts and 4 ignition coils.
    
    Fig 2: Identifying Ignition Coils
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. for Bank 2:
  Remove the 4 ignition coils.
  1. Detach the 2 clamps and disconnect the engine wire.
    
    Fig 3: Identifying Ignition Coil Connectors (Bank 2)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Disconnect the 4 ignition coil connectors.
  3. Detach the clamp and disconnect the engine wire.
    
    Fig 4: Identifying Clamp & Engine Wire
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Remove the 2 bolts and disconnect the No. 4 water by-pass pipe.
    
    Fig 5: Identifying No. 4 Water By-Pass Pipe
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Remove the 4 bolts and 4 ignition coils.
    
    Fig 6: Identifying Ignition Coils
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE SPARK PLUG
1. Using a 16 mm plug wrench, remove the 8 spark plugs.

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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.