Recent content by abefroman
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Strange P0420 issue with 2017 Tahoe 5.3
We did just replace the downstream o2 sensor with a GM one, still same issue. I did look for broken manifold bolts on the Driver's side but didn't see any.- abefroman
- Post #3
- Forum: Engine & Drivetrain
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Strange P0420 issue with 2017 Tahoe 5.3
My girlfriend recently had a new piece of exhaust pipe welded in after the cat, after discovering a hole in the factory pipe. About a week later, she's getting a P0420 code. Truck has about 120k on it. According to the torque pro graphs, the cat would look to me as it's mostly doing its job...- abefroman
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- Replies: 2
- Forum: Engine & Drivetrain
