LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2004 >> LS 430 >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust Assembly >> Exhaust Pipe ASSY >> Replacement
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Exhaust Pipe ASSY: Replacement

  1. REMOVE FRONT FLOOR BRACE CENTER 
    1. Remove the 4 bolts and floor brace.
  2. Bank 1, 2 sensor 2: REMOVE HEATED OXYGEN SENSOR 
    1. Remove the 2 sensors.
  3. REMOVE EXHAUST PIPE ASSY FRONT 
    1. Loosen the clamp.
    2. Remove the 4 bolts, 4 nuts, pipe and 2 gaskets.
  4. REMOVE EXHAUST PIPE ASSY CENTER 
    1. Loosen the 2 clamps.
    2. Remove the pipe.
  5. REMOVE EXHAUST PIPE ASSY TAIL (LH) 
    1. Remove the pipe from the 3 rings.
  6. REMOVE EXHAUST PIPE ASSY TAIL (RH) 
    1. Remove the pipe from the 3 rings.
  7. INSTALL EXHAUST PIPE ASSY FRONT 
    1. Install the 2 new gaskets to the pipe.
    2. Install the pipe to the TWC with the 4 bolts and 4 nuts.

      Torque: 44 N.m (450 kgf.cm, 32 ft.lbf) 

      NOTE:
      • Check if an old gasket still remains on the pipe. If so, remove it.
      • Check if any bolts or nuts are rusted. If so, replace them.
  8. Bank 1, 2 sensor 2: INSTALL HEATED OXYGEN SENSOR 
    1. Install the 2 sensors.

      Torque: 44 N.m (450 kgf.cm, 32 ft.lbf) 

      HINT:

      • Before installing the sensor, twist the sensor wire counterclockwise 3 and 1/2 turns.
      • After installing the sensor, check that the sensor wire is not twisted. If it is twisted, remove the sensor and reinstall it.
  9. INSTALL EXHAUST PIPE ASSY CENTER 
    1. Install the pipe.
    2. Tighten the clamp.

      Standard dimension (A): 13 to 15 mm (0.51 to 0.59 in.) 

      NOTE: Check if the bolt and/or clamp are rusted. If so, replace them.
      Fig 1: Tightening Clamp
      G01051746Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. INSTALL EXHAUST PIPE ASSY TAIL (RH) 
    1. Install the pipe with the 3 rings.
    2. Tighten the clamp.

      Standard dimension (A): 13 to 15 mm (0.51 to 0.59 in.) 

      NOTE: Check the bolt and clamp for rust. Replace rusted components.
  11. INSTALL EXHAUST PIPE ASSY TAIL (LH) 
    1. Install the pipe with the 3 rings.
    2. Tighten the clamp.

      Standard dimension (A): 13 to 15 mm (0.51 to 0.59 in.) 

      NOTE: Check the bolt and clamp for rust. Replace rusted components.
      Fig 2: Tightening Clamp
      G01051747Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. INSTALL FRONT FLOOR BRACE CENTER 
    1. Install the floor brace with the 4 bolts.

      Torque: 7.4 N.m (75 kgf.cm, 65 in. lbf) 

  13. CHECK FOR EXHAUST GAS LEAKS 

    If gas is leaking, tighten the areas necessary to stop the leak.

    If damaged, replace it.

scientia non olet · About LEMON Manuals