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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical (Pr25DD) (2 Of 2)) >> Removal And Installation >> Catalyst >> Fwd Models With Pr25DD Engine >> CATALYST : Removal & Installation >> Removal

CATALYST : Removal & Installation: Removal

WARNING: This page is about a different variant/trim than selected.
  1. Remove the engine cover. Refer to Removal and Installation .
  2. Remove the front exhaust tube. Refer to Exploded View .
  3. Remove the catalyst gusset.
  4. Remove the EGR inlet tube heat shield. Refer to EGR SYSTEM : Exploded View .
  5. Remove the bolts securing the EGR inlet tube to the catalyst.
  6. Disconnect the harness connector from the air fuel ratio (A/F) sensor 1.
  7. Remove the air fuel ratio (A/F) sensor 1 (1) using a suitable tool.
    CAUTION:
    • Do not damage air fuel ratio (A/F) sensor 1.
    • Discard any air fuel ratio (A/F) sensor 1 which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; replace with a new one.
  8. Remove the catalyst heat shield.
    CAUTION: Do not reuse catalyst heat shield bolts.
  9. Loosen catalyst nuts in reverse of the sequence shown.
    Fig 1: Catalyst Nuts Tightening Sequence
    GNSALBIA0510Z-510Courtesy of NISSAN NORTH AMERICA, INC.
  10. Remove the catalyst.
    CAUTION: Do not reuse catalyst gasket.
  11. Remove the studs (if necessary).
    CAUTION: Do not reuse studs.
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