
Panic as had a chap coming round for a reading at 6pm

Battery was flatter than a witches tit and the car "charger" pack was not cutting the mustard (it's great for topping up while doing a reading, but didn't have the amps to jump the battery into taking a charge.
Anyway, wife dug out a spare charger and after hours of charging we got 100%

So chap comes round and I plugged in. Found his VIN and went from there, but something was glitching. I couldn't get any codes or even into the ECU ot would seem!!!
I tried shutting down, but it wouldn't so I restarted the computer "just" to be able to start over

I tried Lexia and Scantool, but neither were really helpful.
It told me to switch off ignition and switch back on, which I did, but it wouldn't progress from there (it also told me to plug into the OBD, but duh! I was in already, otherwise how could it have got the VIN

So, I know it's highly likely operator error. But what am I missing?
Any advice gladly accepted.
Oh and he was sold a dud. Lights on and fuel filter bypassed as some clown had broken off a pipe connector. So they chopped off the ends of a couple of pipes to the pump and the injector rail and popped on a bypass rubber hose and jubilee clips

He needs a filter housing (easy) but finding pipework in this post apocalypse is less easy....
Car starts, runs beautifully and revs all the way. Few minutes go by and it's in limp mode at 3000 which makes for a fun time pulling up hills and the like. Hence the desperate need for a code reading.