mggst6
New member
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- Nov 3, 2025
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- Buick Ownership
- Buick Regal 2014 2.0
Ever since I had my catalytic converter and both oxygen sensors replaced (OEM parts), my 2014 Buick Regal 2.0T struggles to idle or stalls shortly after startup or driving a short distance. It runs fine after those initial stalls once warm.
The shop that did the work replaced one O₂ sensor during the initial cat install, then added the second one later. I’m taking it back for a third visit, but they said it might be “hard to find” and didn’t have a clear next step if the issue continues.
I’ve used this shop for years with no problems, but I’m starting to lose confidence. Has anyone experienced similar cold-start stalling after a catalytic converter/O₂ sensor replacement? Car has ~75k miles, no check-engine light.
The shop that did the work replaced one O₂ sensor during the initial cat install, then added the second one later. I’m taking it back for a third visit, but they said it might be “hard to find” and didn’t have a clear next step if the issue continues.
I’ve used this shop for years with no problems, but I’m starting to lose confidence. Has anyone experienced similar cold-start stalling after a catalytic converter/O₂ sensor replacement? Car has ~75k miles, no check-engine light.
