Would an Italian tune-up help ???

The O2 sensor data looks wrong. They should be switching at similar rates, so maybe it's time to put new ones in ? All the other charts appear ok to me, but it's dificult to tell from the pictures. As I said before it's generally not recommended, but try cleaning them with Carb Cleaner.

surely that would not work because the join is well before the centre box.

I might be in Reading next week, but don't know what day yet. If you're nearby I can bring my Nanocom.

Nanocom also shows BECM inputs including the window switches. That together with the ability to activate outputs to test the windows & locks means you can nail down where the fault is.

Not usually. Two Cats feed a single centre box, that then splits to two rear boxes. But saying that my MOT guy did find differences in the two tailpipe emissions !! Even he agreed it didn't make sense.

GEMS definitely has separate trims for each bank. Don't know about Thor. The pics above do show trim values, but the recording Pete12345 sent shows zeros ?? Also Nanocom is labelling them as Downstream when it should show Upstream Trims, hence why I asked for Thor Instrument mode...

But that one didn't tell us to ignore it . . . hence we actually did ignore it.

None of those show the O2 sensors. As said several times now, emissions depend on O2 Sensors, MAF, Engine speed & Temp, plus Air Leaks and how the trims are behaving. Not got one, but from various forums it appears Thor are much more sensitive to O2 sensors or MAF being out of range. 1) did...

Another thing to try is to use Nanocom Instrument Mode for recordings. Select Instruments & Motronic. Make sure Auto Recording is OFF. Then start the car & enable recording. Here's an example of the recording from one or my P38's. This includes the Engine speed, Airflow, O2 Sensors &...

I'm still ignoring this

Well that data shows essentially the same as post #30 above. Both O2 sensors are switching, although Bank-B voltage range is lower than Bank-A. My understanding is this shows the air-fuel ratios are adjusting more on Bank-A, but not sure which side is better ! Did you try swapping them...

Rather than uploading lots of duplicate pictures that don't show dynamic values, just upload the recording file from Nanocom. Make sure you do the recording at Idle & 2500rpm. Before you upload, change the filename from "xxxxx.csv" to xxxxx.txt or the forum will reject it. Process is the...

BTW, re the thread title, what is "faked" ? or did you mean "failed"

Unless you have O2 sensors after the CAT's (i.e. 2 pre & 2 post), don't bother with the Downstream values. Main focus should be these values: Upstream Bank-A & Bank-B Short term trims Long term trims MAF Throttle & RPM Is the ECU in Closed-Loop or not ? The O2 sensors are switching, so they...

ok. Ignoring . . . .

Pressure test with engine hot & not running ?

Fixed it . . . .but your reply doesn't update

Yes after you guys pointed it out, I checked RAVE & it does vaguely show the correct orientation. Can I be bothered to remove & refit ?? Hmmm.

Look for “RAVE All Models” version. It’s got lots of Classic RR stuff