Just back from NISSAN, and the top tech printed off the FAULT sheet as follow:
DTC P0420,P00430 - Three way catalyst function
Trouble diagnosis name - Catalyst system efficiency below threshhold
DTC detecting condition - 1. Three way catalyst 1 does not operate properly
2. Three way catalyst 1 does not have enough oxygen storage capacity
Possible Cause - 1. Three way catalyst 1
2. Exhaust tube
3. Intake Air Leaks
4. Fuel injector
5. Fuel injector leaks
6. Spark Plug
7. Improper ignition Timing.
When the frequency ratio of air fuel ratio (A/F)SENSOR 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst 1 malfunction is diagnosed.
The sheet was pretty detailed, and had a diagram of the catalysts, sensor positions etc!!
Anyway, the light is now off, and the Z is booked in for next wednesday, for which I will get an 08 Zed to drive around in and they will check the Plennum spacer to make sure there are NO air leaks etc, as this is one of the odds on favourite to be the cause, NOT the cats!
Fingers crossed!!
Jerry
*STOP PRESS* Found out that the previous owner had the spacer fitted december 08, and the engine light has been recorded as coming on, and corrected under warranty.
Im beginning to think that the Spacer has a fault or it hasnt been fitted correctly...