Check Engine Light on...got the code P0420, what should I look for? - G35Driver
Show Your Support Become A Premier Member


Activity Stream: Show All | New Threads | New Posts | New Pictures | Popular Threads | Lonely Threads | Only Vendor Threads | New Picture Comments | New Profile Comments |
Go Back   G35Driver > Tech Area - V35 > Engine, Drivetrain & Forced-Induction
Sign in using an external account
Register Forgot Password?
Search


Welcome to G35Driver.com!

Check Engine Light on...got the code P0420, what should I look for?

Reply
 
 
 
 
Thread Tools Search this Thread Rate Thread
  #1  
Old 10-27-2010, 03:44 PM
Registered User
 
Join Date: Apr 2008
Location: Woodland Hills, CA (818)
Posts: 1,196
Thanked 5 Times in 5 Posts
iTrader: (4)
Check Engine Light on...got the code P0420, what should I look for?

So the check engine light came on, so I used my Actron Scanner and found the car is throwing a P0420 code...

From the site:
"Code P0420 indicates that the exhaust gas exiting the catalytic converter is too similar to the exhaust gas entering the converter. A faulty or overloaded converter due to an unbalanced air/fuel mixture can cause this condition."

Anyone else have this code with our cars? What should I look for?

Thanks!
__________________
Current: 335i Msport - Previous: 370Z Roadster Touring SOLD 06 DG Coupe MT - SOLD
Reply With Quote
  #2  
Old 10-27-2010, 03:58 PM
Registered User
 
Join Date: Apr 2008
Location: Woodland Hills, CA (818)
Posts: 1,196
Thanked 5 Times in 5 Posts
iTrader: (4)
By the Way, my car just passed the 90k mark....could it be the cats?
__________________
Current: 335i Msport - Previous: 370Z Roadster Touring SOLD 06 DG Coupe MT - SOLD
Reply With Quote
  #3  
Old 10-27-2010, 10:22 PM
Former G35driver Vendor
 
Join Date: Jan 2008
Location: Vegas
Posts: 3,685
Thanks: 0
Thanked 19 Times in 13 Posts
iTrader: (32)
P0420 is for catalytic converter efficiency

Either the CAT is bad or the O2 sensor - my money is on the O2 sensor.
Reply With Quote
  #4  
Old 10-28-2010, 05:10 PM
Registered User
 
Join Date: Apr 2008
Location: Woodland Hills, CA (818)
Posts: 1,196
Thanked 5 Times in 5 Posts
iTrader: (4)
The scanner checks the o2 sensor and it says it passes the test fine....weird...either way I reset the ecu so im waiting to see if it comes back up
__________________
Current: 335i Msport - Previous: 370Z Roadster Touring SOLD 06 DG Coupe MT - SOLD
Reply With Quote
  #5  
Old 10-28-2010, 05:11 PM
Registered User
 
Join Date: Apr 2008
Location: Woodland Hills, CA (818)
Posts: 1,196
Thanked 5 Times in 5 Posts
iTrader: (4)
Also, how bad is it to drive around if the o2 sensor is out? Could it mess up my car?
__________________
Current: 335i Msport - Previous: 370Z Roadster Touring SOLD 06 DG Coupe MT - SOLD
Reply With Quote
  #6  
Old 10-28-2010, 07:03 PM
LMG_35C's Avatar
Registered User
 
Join Date: May 2005
Location: New Jersey
Posts: 351
Thanked 2 Times in 1 Post
iTrader: (1)
Scanner is saying that the sensor reading / resistance is within range, not that it's reading correctly. A lot cheaper to replace sensor than the cat.

Driving with a bad sensor is going to effect emissions and probably fuel consumption. That code is for Bank 1 (driver I think), you could swap sensors and see if the problem follows... then you'll have a better answer.
__________________
'04 6MT TB Cpe-Z-Tube-MD 3/8 Spacer-MREV2 Plenum-EibachSways-Debadged-Berk HFC-MD XYZ-Osiris Tune
Reply With Quote
  #7  
Old 11-03-2010, 05:54 PM
Registered User
 
Join Date: Apr 2008
Location: Woodland Hills, CA (818)
Posts: 1,196
Thanked 5 Times in 5 Posts
iTrader: (4)
Thanks LMG....how hard is it to change the sensors? Can I do it with basic tools?

Also, I would basically have to buy 2 new sensors and if its not the sensors then im stuck with the ones i bought...

Should I just replace the Cat? I was thinking of going hi-flow cat either way....
__________________
Current: 335i Msport - Previous: 370Z Roadster Touring SOLD 06 DG Coupe MT - SOLD
Reply With Quote
  #8  
Old 11-04-2010, 12:11 PM
HangUp n' Drive's Avatar
Registered User
 
Join Date: Aug 2010
Location: Freeport, TX
Posts: 613
Thanked 7 Times in 7 Posts
iTrader: (0)
Leaks can cause this fault also. The O2 sensors before the cats control the A/F mixture.
The O2's after the cats verify converter operation.
Reply With Quote
Old 11-04-2010, 12:11 PM
 
 
 
Reply

Tags
350z, actron, car, check, code, codes, converter, drive, efficiency, engine, light, md, obd, p0420, safe, scanner, stillen


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off




All times are GMT -4. The time now is 11:17 AM.

Copyright 2002 - 2008, G35DRIVER.COM All Rights Reserved.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS


G35Driver.com | My350Z.com | MyG37.com | ZDriver.com