Recent Topics
BITOG using excessive CPU power?
by Kibitoshin
06/18/18 05:10 AM
Any news on what happened to this plane?
by Exhaustgases
06/18/18 02:36 AM
E4OD fluid ?
by Exhaustgases
06/18/18 02:23 AM
Update password ?
by meadows
06/17/18 11:59 PM
Delayed Sleep Phase Disorder
by Reddy45
06/17/18 11:56 PM
Nissan DLR put 0w20 in car that specs 5w30. worry?
by CrAlt
06/17/18 10:40 PM
revive Nicd battery
by Donald
06/17/18 10:27 PM
Need help finding an apartment for friend
by RazorsEdge
06/17/18 10:07 PM
ceratec with redline 5w30?
by 08z06
06/17/18 09:53 PM
does your COMCAST modem have weak wifi??
by edwardh1
06/17/18 09:50 PM
I hate stuck thermostats
by jakewells
06/17/18 09:49 PM
Mag1 75w90
by SavagePatch
06/17/18 09:32 PM
Old batteries at HD
by bbhero
06/17/18 09:27 PM
Buying a CPO Toyota - still get inspected?
by Parlay_Slow
06/17/18 09:08 PM
Water Pump Paper Gasket With RTV? Longevity?
by nobb
06/17/18 08:22 PM
Who makes Briggs & Stratton oil?
by spk2000
06/17/18 08:13 PM
Shure stylus replacement
by aquariuscsm
06/17/18 07:54 PM
Any 'crazy UCL overdose' fans out there?
by addyguy
06/17/18 07:11 PM
Source for Castrol Edge Supercar 5w50 oil?
by Rainier42
06/17/18 06:50 PM
Cherry vs orange hand cleaner
by JHZR2
06/17/18 06:27 PM
Newest Members
mostdecent, T1TN, Piper58, dunlop0078, Truth_Syrup
65258 Registered Users
Who's Online
57 registered (4WD, 2009Edge, BeerCan, BigCahuna, antik, aquariuscsm, 5 invisible), 1057 Guests and 39 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65258 Members
67 Forums
285505 Topics
4764742 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4621560 - 01/02/18 10:09 AM 2006 chrysler 3.5 300
jeep58 Offline


Registered: 02/06/09
Posts: 42
Loc: ny
Hi I have this car with 75k on it got it from original owner, the code P0420 came on I reset it with scan tool. it will come on again the car uses oil in between oil 3.5 engines are know for that. The car has plenty of power so cats are not completely clogged. Why would the cat be going so soon and has anyone with this engine 3.5 had the same problems?

Top
#4621585 - 01/02/18 10:34 AM Re: 2006 chrysler 3.5 300 [Re: jeep58]
Rolla07 Offline


Registered: 11/05/11
Posts: 4732
Loc: MTL, CANADA
http://www.p0420.com

Check for holes in exhaust pipe, 02 sensor etc.
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


Top
#4621777 - 01/02/18 01:29 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
jeep58 Offline


Registered: 02/06/09
Posts: 42
Loc: ny
I have a friend that owns a garage the system is all stainless steel no leaks, I know theses engines use oil just wandering if that is the cause of the check engine light coming on!

Top
#4621911 - 01/02/18 03:50 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
JMJNet Offline


Registered: 09/06/07
Posts: 928
Loc: TX, USA
P0420 is usually O2 sensors, there are usually sensors before and after the cat.
Depending on the engine there may be 2 before and 2 after.
At least that was my experience with the Toyota.

You may need to check the forum specific for your car manufacturer to check with their experience fixing this code.

BITOG is more of a generic forum for this type of issue.


Edited by JMJNet (01/02/18 03:53 PM)
_________________________
  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel



Top
#4621941 - 01/02/18 04:20 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
ejes Offline


Registered: 01/11/16
Posts: 313
Loc: Kansas
As said previously, likely an O2 sensor. Some say to replace them all at once if you can, some say just replace them as they go bad. If I can find them all fairly cheaply, and its on a car/truck with a lot of miles or age, I do them all when one fails. I've had good luck with Denso and NTK. I believe the 06 300 V-6 gas 2 upstreams and 2 downstreams and they are all the same model of sensor. You can get NTK's for 25 bucks at RA.

Top
#4621942 - 01/02/18 04:23 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
jeep58 Offline


Registered: 02/06/09
Posts: 42
Loc: ny
Ok Thanks there are 2 sensors on the cat one before and one after any idea as to which one could be bad?

Top
#4621959 - 01/02/18 04:44 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
ejes Offline


Registered: 01/11/16
Posts: 313
Loc: Kansas
Inspect them first for loose or broken wires, etc. I generally suspect the downstream first, but the only way to really tell is with a scan tool that tells you. Some do and some don't. Sometimes AZ and other auto parts places will scan it and tell you if you buy the part there. There are ways to test them with voltmeters, etc. if you google it.

Top
#4622008 - 01/02/18 05:28 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
thorromig Offline


Registered: 03/22/12
Posts: 804
Loc: BerksCounty/Pa.
My good friend a head mechanic at a Cadillac dealership says "always" use OEM O2 sensors when replacing them.
_________________________
00 Dodge Ram 5.2L 4x4 Edge 10W30 FU (91K)
08 Acura TL Type S 3.5L PUPP 5W20 FU (101K)
17 Jetta TSI SE 1.4L Turbo - Edge 0W40 FU (Hers) (4K)

Top
#4622012 - 01/02/18 05:35 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Only use NTK on anything Mopar! O'Reillys carries them.
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

Top
#4622051 - 01/02/18 06:18 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
clinebarger Offline


Registered: 12/19/13
Posts: 1898
Loc: Fort Worth, Texas
Swap the O2 sensors left to right, If you now get a P0430....It's the O2 sensors.

I would bet money it's NOT the O2's
_________________________
2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto

Top
#4622064 - 01/02/18 06:30 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
jeep58 Offline


Registered: 02/06/09
Posts: 42
Loc: ny
Thanks

Top
#4622075 - 01/02/18 06:37 PM Re: 2006 chrysler 3.5 300 [Re: HoosierJeeper]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4204
Loc: Storrs, Connecticut
Originally Posted By: HoosierJeeper
Only use NTK on anything Mopar! O'Reillys carries them.


Yup. Lots of guys on the Jeepforums who use Bosch or something else and have issues or poor fuel economy.
_________________________
2000 Jeep Cherokee 4.0L (179k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

Top
#4622147 - 01/02/18 07:50 PM Re: 2006 chrysler 3.5 300 [Re: jeep58]
Leo99 Offline


Registered: 03/30/14
Posts: 3039
Loc: NJ
From what I've read, worry about the ones upstream first. They are usually the ones that go bad and are usually easier to replace. I know the downstream one on my Corolla was a real bear to get out.

Changing the O2 sensors did fix the P0429 code in my Corolla.
_________________________
Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 359,000 miles
2015 Camry 59,000 miles

Top