How to Replace Catlytic Converters _A Guide

January 9, 2023

Catalytic Converters, Parts Replacement

Mechanic working under a car, wearing glasses and gloves. He's on the ground, using tools near a tire.

Catalytic converters are vital components. While your wheels will still turn without them, Texan laws make them a compulsory attachment to your exhaust.   Your car’s catalytic converter is an emission control device. Its role is to convert all the toxic gases that exit your combustion engine into something less polluting using chemicals such as platinum, rhodium and palladium.   There are a few reasons you may need to know the ins and outs of catalytic parts replacement. Firstly, your catalytic converter may have naturally worn; secondly, it may have been faulty from production; and thirdly, it may have been stolen. In fact, it’s the chemicals inside the catalytic converters that make them a high target for theft.   Replacing catalytic converters can be complex, which is why we’d always stress for ya’ll to come into the DACC shop for professional mechanical help. Although, if you are determined to try it yourself, here are ten steps.  
  1. Raise Your Vehicle Off the Ground
  The first step is to get your entire vehicle off the ground; high enough for you to slide comfortably underneath and work securely. Unlike a tire replacement, a catalytic converter is directly underneath the trunk of your car, meaning you’ll need to use multiple jacks or a lift on a level surface to complete this type of parts replacement.  
  1. Locate Your Catalytic Converter
  After you’ve raised your vehicle, go to the rear end and slide underneath. Here, you should be able to locate your exhaust system. That’s where you’ll find your catalytic converter. Typically, it’ll be a rectangular box in the middle of the exhaust system but it can also be cylindrical in shape.  
  1. Remove the Two O2 Sensors
  Every car built after 1996 will have two oxygen sensors; one before the catalytic converter and one after. Their job is to monitor the exhaust system’s efficiency. To access your catalytic converter, you’ll need to remove these with an oxygen sensor socket and wrench.  
  1. Use a Wrench or Sawzall to Remove the Catalytic Converter
  Catalytic converters are either flanged or welded into place. If your part is flanged, you’ll likely need to apply penetrating oil to loosen up any partially-corroded bolts. Allow the oil to lubricate for several minutes before using a wrench to manually remove the part. Otherwise, use a sawzall or a similar tool to cut the welded sections.  
  1. Sand the Surrounding Flanges and Pipe Ends
  Now your old catalytic converter has been removed, you need to prep the area for the new part. This is a crucial step for most car parts replacement guides. This will ensure the new part securely connects with your car and there will be no exhaust leaks. To do this, use sandpaper to deburr the flanges and pipe ends/cut zones.  
  1. Read the Catalytic Parts Replacement Instructions
  Not all catalytic converters are exactly the same. Neither are vehicles. Because of this, it’s best to always read through the instructions before you begin catalytic parts replacement. If you’re ever in doubt, consult your trusted Texas dealership. Be sure to find professional mechanics and ASE-certified technicians to provide tips.  
  1. Line Up Your New Catalytic Converter
  New catalytic converters need to be installed a certain way around and with matching pipe sizes. There should be an arrow on the part to indicate which way it should face as these components are directional. If a new catalytic converter is installed backwards, the flow direction will be reversed and the part will quickly break.  
  1. Bolt or Weld The New Part in Place
  Both the instructions and the available parts in your car will inform you of whether or not your new catalytic converter will need to be welded or bolted into place. In either circumstance, it’s vital you take precautions and use professional-grade tools. When you’re ready, always start with the front (the end furthest from the exhaust).  
  1. Re-Attach Your Two O2 Sensors
  With catalytic parts replacement, you’re not finished when the new part is in. In one of the first steps, your two O2 sensors were removed; you need to re-attach them to either end of your converter. When you do, ensure all wiring is not damaged as this may lead to a false “check engine” notification on your dash.  
  1. Check for Exhaust Leaks
  The final step is to ensure all parts are securely in place and there are no leaks in emissions before you head out onto the highway. Start your engine and listen out for any unusual noises. Then, jack the rear of your car, start it in park and slowly run a lighter down the piping of your exhaust. Gas leaks will cause your flame to waver.   And that makes all ten steps of how to replace catalytic converters. It’s important we say that working on the replacement of your engine’s exhaust or any of its attachments like your catalytic converter can be very dangerous. If you are looking to do catalytic parts replacement yourself, be sure to have all the right equipment and protective gear. For example, suitable jacks, eyewear and gloves.   When you’ve finished replacing your catalytic converter, there are more advanced tests that need to be done using autobody shop tools. These will include temperature tests, CO2 tests, smog tests and oxygen storage tests.   If you want advice, new converter testing or full catalytic converter replacement, contact our specialized team at Dealership Autoplex Collision Center, today. Either call us at (972) 242-0092, visit our website or come straight to our shop here in Carrollton, TX.   Replacing the Stolen Catalytic Converters in Texas 4 Reasons for the Parts Shortages Throughout Texas How an I-CAR Certified Technician Means Key Care for Your Car

How Modern Vehicles Absorb Collision Impact Differently Than Older Cars

May 20, 2026
Many drivers assume that newer vehicles should always look less damaged after an accident because of advances in automotive engineering. In reality, modern vehicles are often designed to absorb collision energy differently than older vehicles, which can sometimes make accident damage appear more extensive even during lower-speed impacts.  At Dealership Autoplex Collision Center, we regularly help customers understand that modern collision damage is closely connected to how today’s vehicles are engineered for occupant safety. What may initially appear to be excessive damage is often part of the vehicle’s designed crash protection system.

Why Your Vehicle Should Be Inspected by an ASE Certified Technician After an Accident

May 13, 2026
After a vehicle accident, many drivers focus first on visible damage. Dents, cracked bumpers, broken lights, and scratched paint are often the most obvious concerns. However, some of the most serious problems caused by a collision are not immediately visible from the outside. Even relatively minor accidents can create hidden structural, mechanical, or safety-related issues that affect how a vehicle performs afterward.  This is why having the vehicle inspected by an ASE-certified technician is so important following an accident. At Dealership Autoplex Collision Center, we understand that collision repair involves far more than cosmetic appearance. Proper post-accident inspections help identify hidden damage that could affect vehicle safety, drivability, and long-term reliability.

What Quality Control Looks Like in Professional Collision Repair

May 3, 2026
When a vehicle is brought into a collision repair shop, most owners focus on the visible outcome. They expect the dents to be gone, the paint to match, and the vehicle to look as it did before the accident. While appearance is important, professional collision repair goes far beyond surface-level results. At the center of that process is quality control, a structured approach that ensures every repair meets safety, performance, and aesthetic standards before the vehicle is returned.  Understanding what quality control involves helps explain why thorough repairs take time and why attention to detail is essential. More Than a Final Check Quality control is not a single step that happens at the end of the repair process. It is integrated throughout the entire workflow. From the initial assessment to final delivery, each stage includes checkpoints designed to verify that the work is being completed correctly. This approach ensures that issues are identified early rather than after the repair is finished. By maintaining oversight at multiple stages, technicians can confirm that each part of the process aligns with manufacturer specifications and industry standards.
More Posts