Cobalt ss turbo engine light p0420 - Cobalt SS Network

Go Back  Cobalt SS Network > General > 08-10 SS Turbocharged General Discussion
Cobalt ss turbo engine light p0420 >

Cobalt ss turbo engine light p0420

08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

Cobalt ss turbo engine light p0420

Old 06-12-2018, 09:39 AM
  #1  
New Member
Thread Starter
 
Join Date: 02-19-18
Location: Canada
Posts: 13
Thanked 2 Times in 2 Posts
Cobalt ss turbo engine light p0420

Hello I was wondering if someone could help me out. I have 3 codes one of them is p0420 which is cat effienency below threshold bank 1 and then when I scan for e test it says

Catalyst: not passed
oxygen sensor: not passed
oxygen sensor heater: not passed

also I am going through a lot of fuel... also my car stinks of fuel through the exhaust.

the car is tuned, I do have a catted downpipe and I drove the car fine for about a year but now itís running really rich and I have those codes. Idk if I need to get a new catalyst plus new sensors. Or maybe I just need 1 sensor or something Iím not sure thanks!
LnFitness is offline  
Old 06-12-2018, 11:06 AM
  #2  
Senior Member
iTrader: (13)
 
Join Date: 12-20-09
Location: Central, Pennsylvania
Posts: 4,393
Thanked 138 Times in 118 Posts
i would start with the sensors first. you can tune the rear 02 sensor out if you dont want it but when one of those sensors goes bad, the cars will run like absolute **** and youll chug fuel. replace those first and then do a new dp if needed. start with the cheap stuff first
hawkssoccer11 is offline  
Old 06-12-2018, 02:23 PM
  #3  
New Member
Thread Starter
 
Join Date: 02-19-18
Location: Canada
Posts: 13
Thanked 2 Times in 2 Posts
Originally Posted by hawkssoccer11 View Post
i would start with the sensors first. you can tune the rear 02 sensor out if you dont want it but when one of those sensors goes bad, the cars will run like absolute **** and youll chug fuel. replace those first and then do a new dp if needed. start with the cheap stuff first
Thank you, yeah I ordered 2 sensors from gm, if I need a cat Iíll get a downpipe with one through zzp.
LnFitness is offline  
The Following User Says Thank You to LnFitness For This Useful Post:
hawkssoccer11 (06-12-2018)
Old 06-12-2018, 10:30 PM
  #4  
Senior Member
 
Join Date: 03-26-08
Location: Somewhere, MI
Posts: 3,420
Thanks: 0
Thanked 3 Times in 1 Post
sounds like you need a new upstream O2 sensor
krispy is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
water32
2.4L LE5 Performance Tech
2
06-26-2012 09:53 PM
XCRuna1201
2.0L LSJ Performance Tech
20
05-06-2008 08:23 PM
hosal
Problems/Service/Maintenance
2
09-10-2007 09:11 PM
p7x
Problems/Service/Maintenance
23
04-07-2007 01:39 AM
TCarter
Problems/Service/Maintenance
1
12-06-2006 04:30 PM


Thread Tools
Search this Thread
Quick Reply: Cobalt ss turbo engine light p0420


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.