Not scoped the valve as not sure what to expect when good or faulty compared to rail pressure sensor.

Followed guided tests as per official manual which is several pages long checking for air in fuel,lack of supply, pressure sensor checks at idle and then try re-learn of pump (which i cant do) before suspecting pump issues.

Spoke to very helpful technician at delaer who also helped me with diagnosis of pump and advised we try a suction control valve and re-learn before changing pump as most of the issues they had were down to that.

What we could do with on live data is "Target fuel pressure" as the DTC descibes the fault as "Fuel pressure is too much higher than the target value", Vehicle seems to be ok at idle but unsure what pressure we should expect at other speeds / loads without testing another similar vehicle.

Had a similar one on an x-trail last year which did show this info and operating rate for the SCV and was able to record this info whilst driving to confirm the operating rate ramps up to compensate for incorrect pressure before DTC logged therfore suggesting mechanical issue with valve - fitted valve on that and re-learned and all ok.