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Removing a Catalytic Converter on a 1998 Blazer

If the catalytic converter on your 1998 Chevy Blazer is defective or has damage to the case, replacing it may be necessary. The converter is located under the front cross member, in the area underneath the drivers seat. It uses flanges on both ends to secure it to the rest of the exhaust and houses one of the oxygen sensors in the body of the converter.

Instructions

1

Raise the front of your Blazer with a jack and position a set of jack stands under the front suspension to support the truck while you work under it. Lower the jack and remove it from under the truck.

2

Position yourself under the passengers side of the Blazer and locate the catalytic converter in the exhaust system. Find the O2 sensor on the drivers side of the case and follow the wires from the top of the sensor to the wiring harness connector.

3

Release the locking tab on the wiring harness connection, then separate the two halves of the connector. Place an O2 sensor socket on the sensor body and turn it counterclockwise with a ratchet. Remove the sensor and set it aside for reuse later.

4

Move to the rear of the converter and remove the bolts from the mounting flange with a socket and ratchet. Pull the exhaust pipe loose from the converter and push it off to one side.

5

Locate the flange at the front of the catalytic converter. Remove the mounting bolts with a socket and ratchet, then separate the converter from the exhaust pipe.

6

Locate the rubber isolator that supports the converter; slide it off the mounting pin on the frame, then lower the converter down and out of the exhaust system. Slide the catalytic converter out from under the truck.