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TopGun65 Profile
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Date Registered: 07-2015
TOTAL POSTS: 200
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Code P0420 Catalytic Converter Replacement


The orange engine malfunction light has been coming on for a some time now and I've been erasing it, but it started coming on more frequently, so I did some research and tried a few things to correct it. The temp of the exhaust at the inlet of the converter was twice as hot as the outlet, so the problem was there. The engine idle was also starting to hunt. In gear, with the A/C on and foot on the brakes, the engine was almost at the point of stalling.
I tried the Lacquer Thinners solution as seen on youtube, but that didn't work. So I tried the Oxygen Sensor Spacer also from youtube, but that brought up another code, P0139, which is the "Sensor Circuit Slow Response" even more frequently than the P0420 code, so I removed it. I bought 2 new Oxygen Sensors and installed them, but the P0420 code was still illuminating the orange engine light on the dash.
I called Hitech Exhaust at Darlinghurst and spoke to Lambros, and he booked my car in to have the Catalytic Converter replaced the next day. I dropped it off to him at 7am and once it cooled they started working on it. They replaced the original Converter with a Stainless Steel one, and their price was the best price I could get anywhere. Some places around my area were charging twice as much. It was a good experience from booking it in, right through to picking it up, and the workmanship is great. I highly recommend them. The P0420 code and the orange engine light have not come back since. Also, the engine idle rpm is now perfect again, so all in all it was a great result.



Last edited by TopGun65, 11/Oct/2019, 8:35 am


---
Eric
X-4282 (c)
Glen Alpine, Sydney
2010 T31 Cvt STL
27/Aug/2019, 6:33 pm Link to this post Send Email PM   Send Private Message Blog
 
dlpeek Profile
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Date Registered: 12-2010
Location: Macquarie Fields SYDNEY
TOTAL POSTS: 1003
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Re: Code P0420 Catalytic Converter Replacement


Glad to hear you had your issue resolved and your mighty exy is all good to go go go again.
As I have the same model and year as yours I guess I may have that same issue in the future so I will know who to go to when/if the time comes. How many Ks you done now Eric? I am only up to 142,000Ks on the clock.

Cheers



---
Dave Peek
X-1756 (c)
2010 T31 ST-L (S2) CVT Precision Grey.
Tow Bar, bash plates, PEDDERS lift, YOKO GEO AT/S tyres.


28/Aug/2019, 6:46 am Link to this post Send Email PM   Send Private Message Blog
 
TopGun65 Profile
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Date Registered: 07-2015
TOTAL POSTS: 200
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Re: Code P0420 Catalytic Converter Replacement


Hi Dave,
 The first time the engine light came on was at 138,000 K's nearly 2 years ago, but that was infrequently. I'm now on 176,000 K's, and the light was coming on after an hour of driving. I was told that E10 fuel (very rarely do I use it) can cause this problem even if the engine is designed to run on this fuel. Here's hoping you have a lot of K's left in yours.

Edit.... 187,000 K's and the engine light hasn't come on.


Cheers

Last edited by TopGun65, 30/Jan/2020, 2:55 pm


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Eric
X-4282 (c)
Glen Alpine, Sydney
2010 T31 Cvt STL
28/Aug/2019, 9:36 am Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 12-2010
Location: Macquarie Fields SYDNEY
TOTAL POSTS: 1003
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Re: Code P0420 Catalytic Converter Replacement


Thanks Eric. Whenever I go to Bunnings at Crossroads I pop into Costco to fill up with fuel. Costco used to sell 91 Octane but have since replaced it with E10. I have never experienced any trouble with E10 (fingers crossed). However, when I usually fill up, other than at Costco, I use 91 as it is usually only 2 - 3 cents dearer than the E10.
I definitely save more than the $60 Costco membership yearly fee in fuel costs during a year by using Costco plus general Costco savings on other Costco products when we shop there every now and then.
So, E10 being 94 Octane is supposedly making the engine a bit zippier BUT it burns quicker so supposedly less economy. To tell the truth I have not noticed any difference in economy between E10 and 91 while driving in suburbia etc. When my wife and I travel I don't use E10 but either 91 or 95. I do find that 95 tends to get me more Ks per tank full on a long trip with regular use of cruise control.
But around the burbs it's usually 91..... or E10 if I happen to be near Costco.

cheers

---
Dave Peek
X-1756 (c)
2010 T31 ST-L (S2) CVT Precision Grey.
Tow Bar, bash plates, PEDDERS lift, YOKO GEO AT/S tyres.


28/Aug/2019, 4:33 pm Link to this post Send Email PM   Send Private Message Blog
 
Number77 Profile
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Date Registered: 09-2020
TOTAL POSTS: 7
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Re: Code P0420 Catalytic Converter Replacement


quote:

TopGun65 wrote:


I called Hitech Exhaust at Darlinghurst and spoke to Lambros, and he booked my car in to have the Catalytic Converter replaced the next day.




How much did that cost you?

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Lister
X-5908
Perth
X-TRAIL ST-S T30 II Auto JUL 2006
15/Sep/2020, 9:24 am Link to this post Send Email PM   Send Private Message Blog
 
TopGun65 Profile
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Date Registered: 07-2015
TOTAL POSTS: 200
Reply | QUOTE
Re: Code P0420 Catalytic Converter Replacement


From memory it was around $750 and took a few hours to change.

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Eric
X-4282 (c)
Glen Alpine, Sydney
2010 T31 Cvt STL
15/Sep/2020, 1:19 pm Link to this post Send Email PM   Send Private Message Blog
 
Number77 Profile
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Date Registered: 09-2020
TOTAL POSTS: 7
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Re: Code P0420 Catalytic Converter Replacement


Whoa That's not bad at all! I had a quote at $1200 now I have to find another one.

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Lister
X-5908
Perth
X-TRAIL ST-S T30 II Auto JUL 2006
15/Sep/2020, 3:29 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6116
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Re: Code P0420 Catalytic Converter Replacement


quote:

TopGun65 wrote:
From memory it was around $750 and took a few hours to change.



Was that the factory cat converter near the engine or the Hitech one installed underneath the Xtrail in the new exhaust ?

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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15/Sep/2020, 4:55 pm Link to this post Send Email PM   Send Private Message Blog
 
TopGun65 Profile
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Date Registered: 07-2015
TOTAL POSTS: 200
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Re: Code P0420 Catalytic Converter Replacement


That was the factory cat converter welded to the manifold at the front of the engine in between the two oxygen sensors.

---
Eric
X-4282 (c)
Glen Alpine, Sydney
2010 T31 Cvt STL
15/Sep/2020, 6:15 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 07-2015
TOTAL POSTS: 38
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Re: Code P0420 Catalytic Converter Replacement


as i have the same code come up, im doing a bit of research instead of being just a parts fitter.
i've asked a few shops on the subject. At one we scanned we found the #2 sensor was changing voltage so i replaced it and cleared the code, but it came back later on. Still the same code.
I have the Copy of the Nissan T30 workshop CD and only today found a reference to the code.
So it has few things to check out now.
DTC P0420 THREE WAY CATALYST FUNCTION PFP:20905
On Board Diagnosis Logic BBS001E9
The ECM monitors the switching frequency ratio of heated oxygen
sensors 1 and 2.
A three way catalyst (manifold) with high oxygen storage capacity
will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2
switching frequency will increase.
When the frequency ratio of heated oxygen sensors 1 and 2
approaches a specified limit value, the three way catalyst (manifold)
malfunction is diagnosed.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0420
0420
Catalyst system efficiency
below threshold
 Three way catalyst (manifold) does not operate
properly.
 Three way catalyst (manifold) does not have
enough oxygen storage capacity.
 Three way catalyst (manifold)
 Exhaust tube
 Intake air leaks
 Fuel injector
 Fuel injector leaks
 Spark plug
 Improper ignition timing.
it was a bit hard to add images in the original format, but you should get the idea.

Has anyone used the TOAD pc SCAN software on their T30. They say it works on 1/2006 onwards. Mine is 8/2006. but Toad said it wouldn't work but the Neighbor has it, plugged it in quickly and it works but he isnt used to using it. So not sure if all features work.
Would like any feed back.
TIA


---
JC
X-4323
T30 August 2006
Near Wagga Wagga.
13/Feb/2022, 8:59 pm Link to this post Send Email PM   Send Private Message Blog
 


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