MAF Sensor

Running properly on petrol first is my advice. One thing I would suggest is to go and get a decent opinion from a good garage. I know it sounds daft but I feel this problem will be cured by a good diagnosing garage in about 15 mins whereas it could take you days and days. The chaps I occasionally use will put a gas sensor up the exhaust (after checking codes) then systematically unplug sensors. 15 minutes they'll have found the cause.

AndySiddall said:

I had exactly the same running issues with my TD5. Replaced the MAF and made all the difference..

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MAF sensor has no influence on how engine runs on a diesel. It is for measuring EGR gas flow. However if it has totally failed and expected signals are not being received by the ECU it can become confused and cause issues.

Thankyou, will try, the garage have already ordered and made me pay for a new MAF ( about £90) and there fitting it Wednesday.
Hopefully this will fix the problems, its been a pain. it started when it went into reduced engine mode, took to garage, they then put new battery/spark plugs/air filter/oil filter/oil filter/and a new supercharger coolant pump. worked fine for a week, then did it again. Thus the new MAF being ordered.
Cost so far £1128.00 will it ever end ?

I can only report what happened to me which is what the original post asked. Everyone knows how much of an expert I am. I had a fusebox issue (putting it mildly) the symptoms you outline are exactly what I ended up with. I was forced to get a diagnostic toy as I was stuck in southern Spain. The lambdas showed the lovely .447v etc. The maf showed a bit of movement on revving but barely reaching spec. New fusebox no difference but the magic lantern show disappeared. I cleaned the crud off all the contacts on the engine ECU and multi connectors.Marginal difference coincidental with maf element cleaning. Renewed lambdas and maf bosch from island. I'd previously bought two lambdas for 50 quid and a supposed Bosch maf element only. Reverted to original after running like a dog. I bought a gurenteed ECU from Germany and a synchmate. Synched with my heart in my mouth as I feared I'd wiped the becm out with the fusebox thing. I'd fluked that. Admittedly I carried out these measures out of shear desperation with help from landyzone, being a total ignoramus. It all worked in the end.the chain, therefore, is fusebox, ECU, MAF, lambdas and reset adaptive settings.that got me home through Spain, France and 300 miles UK. If you want to know how to do something wrong, I'm your man.

I am the same as you know nothing about mechanics or electrics so have to rely on the honesty of the garage., I can do a bit but if they go wrong I have no idea. Well by the time it has its MAF sensor put on , the engine will have had a lot of new parts fitted within a week.
And I always read that the L322 RR Supercharged 4.2 V8 2006, was reliable out of them all.

navyrn said:

I am the same as you know nothing about mechanics or electrics so have to rely on the honesty of the garage., I can do a bit but if they go wrong I have no idea. Well by the time it has its MAF sensor put on , the engine will have had a lot of new parts fitted within a week.
And I always read that the L322 RR Supercharged 4.2 V8 2006, was reliable out of them all.

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Reliability in Range Rovers is a relative term. On an absolute scale they're bl**dy atrocious. If you want reliability, go Jap and don't look back.

On another note, these cars will bleed you dry if you cannot have a go yourself. The parts for the P38 are cheap as so many are being broken but the L322 is way more expensive, even troubleshooting and doing the labour yourself. So your earlier question, "will it ever end?" is easy to answer: no. Although after the big items have gone it'll have a smaller annual usage fee. Certainly the ZF gearbox is better than the GM box or you would already have had a heart-attack when that went.