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P0420 repeating

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New User

Jun 9, 2017, 12:26 AM

Post #1 of 2 (753 views)
P0420 repeating Sign In

I have a 2008 Chevrolet Suburban, 1500, 4wd, 3.5L, 110000 miles.
Last April I replaced the cats, this April I replaced the brake/cruise control switch. I did disconnect the battery while doing this.
Had my local mechanic replace 3 O2 sensors, I replaced 1 earlier this year. He also did inspection which took 3 days to complete due to me disconnecting battery, and the EVAP system not resetting correctly, but it did on the third day.
The day after I had it inspected it threw a service light, mechanic scanned it, and it pulled a P0420. He cleared it so we could see if it throws the same code anytime later.
Hoping someone could give me some advise, guidance, and or a helping hand.
Thanks in advance for any of these.
If any more info is needed let me know.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 9, 2017, 5:13 AM

Post #2 of 2 (745 views)
Re: P0420 repeating Sign In

What brand of Cats did you replace them with?


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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