2.8JTD Hymer 534 2002 RHD with fuel injection warning light permanently on. I’m not technical so rely on others - the advice I’m getting is plug in an OBD reader to find the problem but the OBD port can’t be found. Could it be that the van pre-dates Fiat fitting OBD points so there isn’t one? Or if there is one what does it look like? My research so far says the early ones were two or three pin. Two mechanics [and I] have searched for it in the engine bay and inside with the dash off without success. Online info says it’s either under the steering wheel area or by the ECU box but on mine it isn’t there or anywhere. Getting stuck and starting to think about replacing parts on a trial and error basis until the light goes out. All advice very gratefully received. TIA