Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6097
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Re: P0420 O2 Sensor
The only way I know to test a cat converter is to have the exhaust gas analyzed. A tuning place with a dynamometer would be able to do that for you but could cost as much as a new cat converter.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
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16/Sep/2020, 8:06 am
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roid
X-TRAIL NEWBIE
Date Registered: 05-2017
TOTAL POSTS: 89
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Re: Anti-foulers?
An extension tube may prevent the sensor causing the code, but it depends on how far from normal the sensor's output is, so may only work for a while, or not at all.
Search for 'O2 sensor simulator' to see how to solve incorrect output electrically just as easily.
Previous series II production to yours was 100% legal with one converter only, but was unable to meet a later regulation without it (Cars are seldom made just for the Oz market, they are part of other RHD production runs so our regulations may not even be applicable). That said, once a model is complied here with a certain emissions system, you cannot lawfully modify it.
Previously produced X-eys ran better with only one converter, and managed not to create clouds of pollution or upset anyone. The second cat was just a kludge Nissan applied to the existing design to meet a stiffer emissions regulation. Bear in mind that cats should recess into the floorpan/engine compartment and be adequately heat shielded, and cooled- not just monitored for failure. A series II X-ey's second cat hangs very low, as Nissan cheaped out on exhausts from the beginning (using a aluminised/mild steel exhaust rear sections instead of full stainless for a car that burns ULP was foolish at best). But then, they couldn't meet later regulations without adding the additional cat. They should have optmised the design to use slimline cats, and made some room for it somewhere, but by then they had the T31 coming and put their effort on that instead. So they hung it off the bottom in the middle where every rock and protrusion (including speed humps) will hit it.
So enjoy your second cat if you still have it, and replace it if it fails, and replace its sensor if that fails, or kludge the sensor (if your cat is ok), or fit an electric kludge. An exhaust that doesn't have the second cat is the optimal solution (if using the car 'off road'), just don't expect someone to remove it or kludge it for for you. Hmm. 'nuff said?
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05 T30 ST-X Auto
205/75x16 A/Ts on 6.5" ET40
200k: Refreshed suspension,fuel, ignition & cooling systems
Often good & dirty as is lifted 35mm on Sachs Automatics & poly bushings
Northern Sydney, NSW
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16/Sep/2020, 8:11 am
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