SPONSORED LINKS

Check engine light and code P0420

Tiny
SEDWARDS15763
  • MEMBER
  • 2009 PONTIAC TORRENT
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 148,732 MILES
I have owned this vehicle since new.

Initially took vehicle to dealer for a continuous crank upon start issue. Replaced the EGR. Seemed to cure that problem. No error codes or lights with this issue.

Traveled about 6 miles from dealership and check engine light came on. Returned to dealer and they indicated it was the catalytic converters. Replaced same with aftermarket unit.

Traveled about 150 miles and check engine light came on. Vehicle running fine. Had code checked and it was a P0420 error. Had both o2 sensors replaced.

Drove about 20 miles after that repair and check engine light came on again. Code is still P0420.

What else can it be? I am tired of being a guinea pig.

Thanks!
SPONSORED LINKS
Monday, December 9th, 2019 AT 10:23 AM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Do you know what brand they used for the catalytic converters? The 420 is a catalytic converter code for a bad converter. Using an aftermarket converter rarely works. You need a good quality catalytic converter.

Do you have the receipt?

Roy
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 11:03 AM
Tiny
SEDWARDS15763
  • MEMBER
  • 6 POSTS
Unfortunately, I do not know the aftermarket brand. I was thinking upgrading it to a MagnaFlow direct fit one. OEM is about twice the cost.
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 11:24 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would only use a Walker or a Bosal. They have a 5-year warranty on the light returning.

I attached them below.

Roy
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 11:34 AM
Tiny
SEDWARDS15763
  • MEMBER
  • 6 POSTS
Those seem very reasonable. I will try that and let you know the result.
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 12:34 PM
Tiny
SEDWARDS15763
  • MEMBER
  • 6 POSTS
I am unable to locate that pricing. Where did you obtain?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 12:55 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Rock auto. Go to rockauto. Com.

Roy
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 1:16 PM
Tiny
SEDWARDS15763
  • MEMBER
  • 6 POSTS
What is the difference between the Walker and Bosal?
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 1:34 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Walker is the top brand and that is what I use unless there is no one available, I will use Bosal.

They both are the only ones who will offer a 5-year warranty on the light.

Roy
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 1:45 PM
Tiny
SEDWARDS15763
  • MEMBER
  • 6 POSTS
Thank you!
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 2:00 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
Was this
answer
helpful?
Yes
No
Monday, December 9th, 2019 AT 2:17 PM

Please login or register to post a reply.

Related Check Engine Light Content

Sponsored links