I ordered a set of the pre-cat and post-cat sensors from an eBay seller located in Brisbane, QLD on 31st January and got delivery 1st February.
3 of these sensors were manufactured in Japan. As advertised, one of the post cat sensors was manufactured in the USA and branded DENSO First Fit.
I also located previously purchased pre-cat [air-fuel] sensors that were also branded DENSO First Fit. These were the ones that I fitted plus both of the post-cat sensors.
The replaced sensors have been retained and will get a good clean, eventually.
The problem I had with my 2009 200 series with it not changing up to 5th or 6th gear ended up being an easy fix late last year. To go back to beginning - 8 months prior to the start of the problem, I had the intake manifold cleaned by a diesel performance company and they talked me into having an EGR blank plate installed and adjust the ECU accordingly, which I agreed to while I was there. Then 8 months later it started to intermittently not go past 4th gear. The company said this issue had nothing at all to do with what they had done with the EGR. The problem got worse over a period of 12 months and it became a permanent 4 speed gearbox. After taking the car to numerous other places without success I ended up back at the original company who had by then come up with a solution. They said it was basically in a type of limp mode, so they did a minor remap of the ECU of some sort and I think they turned off the EGR valve. Probably not legal but anyway. If I hadn't done the blank plate 2 years ago it would've saved me a lot of trouble. It's all good now though.
I have previously removed the air intake plenum when replacing the spark plugs but did not replace those plenum gaskets as they appeared to be in good condition etc.
Now 50,000 kms and a few years later, I have been trying to resolve an engine misfire and P0420 code. My 2006 Aurion now has an odometer of 258,000 kms.
After viewing a YouTube video about the P0420 error code, the recommendation was to replace these gaskets on the plastic air intake and to also check for any minor cracks. The gaskets compress over time and no longer seal resulting in vacuum leak and the error code. Actually I confirmed this when I reversed the existing plenum gaskets and temporarily got the P0430 code while the P0420 code still persisted.
Height on the new plenum gaskets were measured at 7mm using both a micronometer and vernier calipers. Existing gaskets measured at 5.5mm except for one gasket which only measured 5mm in a section.
Following photos show the difference between the old and new gaskets when fitted.
Overall, worthwhile to replace these plenum gaskets when replacing the spark plugs.
Anyone with any luck. I also have a 2010 Gxl that won't go past 4th and 5th and also cruise doesn't work. I've replaced the accelerator pedal. Also when I disconnect the battery and reconnect it, everything works fine for about 5 min and then cuts out.