Service Procedure

1. Inspect both front and rear support brackets on the catalyst front tube (see Figure 1).

^ Brackets are located between the exhaust flange of Bank 1 catalyst and the transmission housing.

^ Check for breaks or cracks, and loose or missing bolts.

^ See examples of breaks and cracks shown below.








NOTE:
^ Breaks or cracks may be found anywhere on the bracket body or at the
mounting bolt holes.

^ Cracks appear in a "hair line" form.

2. If either (or both) of the front and rear support brackets are broken/cracked, or have loose or missing bolts, replace both brackets and all their bolts as follows:

a. Remove and discard the original bolts and brackets.

NOTE:
For Quest with 5 speed A/T only, STOP HERE. No further action is needed. Do NOT install new brackets and bolts after brackets and bolts removal.

b. Loosely install the new front and rear support brackets and bolts.

^ Front and rear support brackets and bolts are listed in the PARTS INFORMATION section of this bulletin.

c. Position both front and rear support brackets so that each bolt is centered in the bolt holes.

d. Hand tighten each bolt to hold it in the centered position.

e. Torque each bolt to 19.0 - 25.0 Nm (1.93 - 2.43 kg-m, 14 - 18.4 ft-lb), starting with the transmission side bolt.











3. For Maxima with 5-speed A/T ONLY, install the exhaust tube mounting brackets (upper and lower) and flange nuts listed in the PARTS INFORMATION section of this bulletin. See Figures 4, 5, and 6.

^ Torque each nut: 30.4-39.2 Nm (3.1-4.0 kg-m, 22.4-28.9 ft-lb)

4. Make sure the rattle/buzzing noise is gone.

^ Conduct a short test drive involving several low speed part throttle accelerations.

^ It is best to listen for unusual exhaust noise while driving with windows down and driving next to an object such as a wall, hedge, or parked cars. Any unusual noises, if they exist, will reflect back to your car and are more noticeable.