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Catalytic converters

Tiny
CPTZEREO
  • MEMBER
  • 2005 CADILLAC CTS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 105,000 MILES
How do you change the catalytic converters on my car listed above it has the 3.6 engine?
Friday, July 15th, 2011 AT 3:36 PM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
You should start with the engine cold then you will need to raise the car up. Start by spraying wd40 on the bolts to help them to be loosen,

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

Here is a guide hat will give you an idea of what you are in for when you are changing the the catalytic converters.

https://www.2carpros.com/articles/catalytic-converter-replacement

Check out the diagrams (Below)

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
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Tuesday, October 3rd, 2017 AT 2:40 PM
Tiny
REBECCA LOPEZ
  • MEMBER
  • 1 POST
  • 2005 CADILLAC CTS
  • 113,300 MILES
The check engine light is going on and I have been told that I need to change the catalytic converter. Will my car make a 700 mile drive to Los Angeles with a non working catalytic converter that needs to be changed?
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Wednesday, February 21st, 2018 AT 5:51 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
It really matters the present condition of the converter. If you have experienced power loss, decreased fuel economy I would say no. If it runs okay you should be fine
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Wednesday, February 21st, 2018 AT 5:51 PM (Merged)
Tiny
JTSALEX
  • MEMBER
  • 1 POST
  • 2006 CADILLAC CTS
  • 106,000 MILES
How long should it take my mechanic to replace, are they replaced from the top or bottom of the engine, and can we just replace one or must we replace both (there are two)? I'm in California. Thanks for your input.
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Wednesday, February 21st, 2018 AT 5:51 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
They are from the bottom. Aprox 2 hours.
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Wednesday, February 21st, 2018 AT 5:51 PM (Merged)
Tiny
EMBONE
  • MEMBER
  • 8 POSTS
  • 2004 CADILLAC CTS
  • 10,000 MILES
Dealer says both catalytic converters need to be replaced. What would be the causes of both at the same time? Have codes of p0341, p2231, p2234 reading on the diagnostics report.
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Wednesday, February 21st, 2018 AT 5:51 PM (Merged)
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Catalytic converter starts breaking up over time. When they do it starts to clog the exhaust from going out the tail pipe. A easy way to check converter is when its cold bang on it from under the car and see if you hear anything loose. If you do then the converter is breaking up. There is a code section that will explain what the codes are.
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Wednesday, February 21st, 2018 AT 5:51 PM (Merged)

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