The original fault code has gone since the valves being reseated. I now have P0172 mixture too rich. This is being triggered by the 1.2v from the oxygen sensor. I have checked all the wiring from the oxygen sensors to the ecu ands scoped the readings from both ends in which they stay constant. I can't post any gas values until the vehicle returns possibly Saturday unfortunately but they all seem to confirm rich mixture with non existent O2 values and CO sitting anywhere from 3 to 5 at idle. All values look perfect on fast idle from memory.
I have found a few used injectors so am going to try replacing cylinder 4 and see what this does. Will post the results
It's always the Japanese that give me issues ha
Thanks for the response