The catalytic converter on your Nissan Altima cannot be repaired if it is defective. Replacement is the only option in these cases. Replacement catalytic converters are available from most auto parts stores but for the best fit, replacements from the dealer are a better option. The converter gets very hot when the car is running so be sure to allow the car to sit for about an hour before attempting this repair.
Difficulty: Moderate
Instructions
Things You'll Need
Jack
Jack stands
Socket set
Ratchet
1
Raise the front of your Maxima with a jack and a set of jack stands under the front suspension. Lower the jack, allowing the car to rest on the stands, and then remove the jack.
2
Crawl under the car. Locate the catalytic converter underneath the center of the car. Four bolts attach the heat shield to the bottom of the catalytic converter case. Remove the bolts with a socket and ratchet then removed the heat shield from the converter body.
3
Locate the flanges at each end of the catalytic converter and remove the bolts on both ends with a wrench. Pull the converter out from between the two exhaust pipe sections and discard it.
4
Lift a new converter into place and insert a new gasket between the exhaust flange and the converter flange on both ends. Install two mounting bolts on each end then tighten them with a socket and ratchet.
5
Install the heat shield using four mounting bolts and tighten them with a socket and ratchet. Raise the car off of the jack stands with your jack, and then remove the stands from under the car.
6
Lower the car to the ground and remove the jack from under the front on the car.
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